1
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Kayyil Veedu M, Hajda A, Olesiak-Bańska J, Wenger J. Three species multiplexing of fluorescent dyes and gold nanoclusters recovered with fluorescence lifetime correlation spectroscopy. Biochim Biophys Acta Gen Subj 2024; 1868:130611. [PMID: 38552746 DOI: 10.1016/j.bbagen.2024.130611] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2023] [Accepted: 03/26/2024] [Indexed: 04/02/2024]
Abstract
Biosensor applications often require the simultaneous detection of multiple analytes, with a clear need to go beyond the traditional multiplexing relying on distinct fluorescent dyes across the visible spectrum. Fluorescence lifetime correlation spectroscopy (FLCS) is a powerful approach taking advantage of the fluorescence lifetime information to separate the contributions of different fluorescent species with overlapping emission spectra. However, so far FLCS detection has been demonstrated only on binary mixtures of two fluorescent dyes, limiting its multiplexing capabilities. Here, we report the first quantitative FLCS measurements within a ternary mixture composed of three different fluorescent emitters with near-identical emission spectra. Two organic fluorescent dyes, Alexa Fluor 647 and CF640R, are combined with water-soluble Au18(SG)14 gold nanoclusters. Our experimental data establish that FLCS allows to accurately determine individual concentrations within intricate ternary mixtures. Another major aspect of interest concerns the assessment of the suitability of gold nanoclusters for FLCS multiplexing applications. With their microsecond lifetime and stable emission characteristics, gold nanoclusters add a valuable new aspect to the array of FLCS probes. Extending FLCS multiplexing beyond binary mixtures paves the way for further progress in the simultaneous highly parallel biosensing of multiple species.
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Affiliation(s)
- Malavika Kayyil Veedu
- Aix Marseille Univ, CNRS, Centrale Med, Institut Fresnel, AMUTech, 13013 Marseille, France
| | - Agata Hajda
- Institute of Advanced Materials, Wroclaw University of Science and Technology, Wrocław, Poland
| | - Joanna Olesiak-Bańska
- Institute of Advanced Materials, Wroclaw University of Science and Technology, Wrocław, Poland
| | - Jérôme Wenger
- Aix Marseille Univ, CNRS, Centrale Med, Institut Fresnel, AMUTech, 13013 Marseille, France.
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2
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Vidal C, Tilmann B, Tiwari S, Raziman TV, Maier SA, Wenger J, Sapienza R. Fluorescence Enhancement in Topologically Optimized Gallium Phosphide All-Dielectric Nanoantennas. Nano Lett 2024; 24:2437-2443. [PMID: 38354357 PMCID: PMC10905999 DOI: 10.1021/acs.nanolett.3c03773] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2023] [Revised: 02/07/2024] [Accepted: 02/08/2024] [Indexed: 02/16/2024]
Abstract
Nanoantennas capable of large fluorescence enhancement with minimal absorption are crucial for future optical technologies from single-photon sources to biosensing. Efficient dielectric nanoantennas have been designed, however, evaluating their performance at the individual emitter level is challenging due to the complexity of combining high-resolution nanofabrication, spectroscopy and nanoscale positioning of the emitter. Here, we study the fluorescence enhancement in infinity-shaped gallium phosphide (GaP) nanoantennas based on a topologically optimized design. Using fluorescence correlation spectroscopy (FCS), we probe the nanoantennas enhancement factor and observe an average of 63-fold fluorescence brightness enhancement with a maximum of 93-fold for dye molecules in nanogaps between 20 and 50 nm. The experimentally determined fluorescence enhancement of the nanoantennas is confirmed by numerical simulations of the local density of optical states (LDOS). Furthermore, we show that beyond design optimization of dielectric nanoantennas, increased performances can be achieved via tailoring of nanoantenna fabrication.
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Affiliation(s)
- Cynthia Vidal
- Blackett
Laboratory, Department of Physics, Imperial
College London, London SW7 2AZ, U.K.
| | - Benjamin Tilmann
- Nano-Institute
Munich, Department of Physics, Ludwig-Maximilians-University
Munich, 80539 Munich, Germany
| | - Sunny Tiwari
- Aix
Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, 13013 Marseille, France
| | - T. V. Raziman
- Blackett
Laboratory, Department of Physics, Imperial
College London, London SW7 2AZ, U.K.
- Department
of Mathematics, Imperial College London, London SW7 2AZ, U.K.
| | - Stefan A. Maier
- Blackett
Laboratory, Department of Physics, Imperial
College London, London SW7 2AZ, U.K.
- School
of Physics and Astronomy, Monash University, Clayton, Victoria 3800, Australia
| | - Jérôme Wenger
- Aix
Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, 13013 Marseille, France
| | - Riccardo Sapienza
- Blackett
Laboratory, Department of Physics, Imperial
College London, London SW7 2AZ, U.K.
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3
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Kayyil Veedu M, Osmólska J, Hajda A, Olesiak-Bańska J, Wenger J. Unveiling the photoluminescence dynamics of gold nanoclusters with fluorescence correlation spectroscopy. Nanoscale Adv 2024; 6:570-577. [PMID: 38235077 PMCID: PMC10790814 DOI: 10.1039/d3na00869j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/09/2023] [Accepted: 12/02/2023] [Indexed: 01/19/2024]
Abstract
Gold nanoclusters (AuNCs) have captured significant interest for their photoluminescent properties; however, their rapid photodynamics remain elusive while probed by ensemble-averaging spectroscopy techniques. To address this challenge, we use fluorescence correlation spectroscopy (FCS) to uncover the photoluminescence dynamics of colloidal Au18(SG)14 nanoclusters. Our FCS analysis reveals the photoluminescence (PL) brightness per nanocluster, elucidating the impact of photoexcitation saturation and ligand interactions. Unlike DNA-encapsulated silver nanoclusters, their gold counterparts notably exhibit minimal blinking, with moderate amplitudes and 200 μs characteristic times. Our data also clearly reveal the occurrence of photon antibunching in the PL emission, showcasing the quantum nature of the PL process, with each AuNC acting as an individual quantum source. Using zero-mode waveguide nanoapertures, we achieve a 16-fold enhancement of the PL brightness of individual AuNCs. This constitutes an important enabling proof-of-concept for tailoring emission properties through nanophotonics. Overall, our study bridges the gap between ensemble-averaged techniques and single-molecule spectroscopy, offering new insights into AuNC photodynamics for biosensing and imaging applications.
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Affiliation(s)
- Malavika Kayyil Veedu
- Aix Marseille Univ, CNRS, Centrale Med, Institut Fresnel, AMUTech 13013 Marseille France
| | - Julia Osmólska
- Institute of Advanced Materials, Wroclaw University of Science and Technology Wrocław Poland
| | - Agata Hajda
- Institute of Advanced Materials, Wroclaw University of Science and Technology Wrocław Poland
| | - Joanna Olesiak-Bańska
- Institute of Advanced Materials, Wroclaw University of Science and Technology Wrocław Poland
| | - Jérôme Wenger
- Aix Marseille Univ, CNRS, Centrale Med, Institut Fresnel, AMUTech 13013 Marseille France
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4
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Roy P, Zhu S, Claude JB, Liu J, Wenger J. Ultraviolet Resonant Nanogap Antennas with Rhodium Nanocube Dimers for Enhancing Protein Intrinsic Autofluorescence. ACS Nano 2023; 17:22418-22429. [PMID: 37931219 PMCID: PMC10690780 DOI: 10.1021/acsnano.3c05008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2023] [Accepted: 09/07/2023] [Indexed: 11/08/2023]
Abstract
Plasmonic optical nanoantennas offer compelling solutions for enhancing light-matter interactions at the nanoscale. However, until now, their focus has been mainly limited to the visible and near-infrared regions, overlooking the immense potential of the ultraviolet (UV) range, where molecules exhibit their strongest absorption. Here, we present the realization of UV resonant nanogap antennas constructed from paired rhodium nanocubes. Rhodium emerges as a robust alternative to aluminum, offering enhanced stability in wet environments and ensuring reliable performance in the UV range. Our results showcase the nanoantenna's ability to enhance the UV autofluorescence of label-free streptavidin and hemoglobin proteins. We achieve significant enhancements of the autofluorescence brightness per protein by up to 120-fold and reach zeptoliter detection volumes, enabling UV autofluorescence correlation spectroscopy (UV-FCS) at high concentrations of several tens of micromolar. We investigate the modulation of fluorescence photokinetic rates and report excellent agreement between the experimental results and numerical simulations. This work expands the applicability of plasmonic nanoantennas to the deep UV range, unlocking the investigation of label-free proteins at physiological concentrations.
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Affiliation(s)
- Prithu Roy
- Aix
Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, AMUTech, 13013 Marseille, France
| | - Siyuan Zhu
- Department
of Chemistry, Duke University, Durham, North Carolina 27708, United States
| | - Jean-Benoît Claude
- Aix
Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, AMUTech, 13013 Marseille, France
| | - Jie Liu
- Department
of Chemistry, Duke University, Durham, North Carolina 27708, United States
| | - Jérôme Wenger
- Aix
Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, AMUTech, 13013 Marseille, France
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5
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Roy P, Claude JB, Tiwari S, Barulin A, Wenger J. Ultraviolet Nanophotonics Enables Autofluorescence Correlation Spectroscopy on Label-Free Proteins with a Single Tryptophan. Nano Lett 2023; 23:497-504. [PMID: 36603115 DOI: 10.1021/acs.nanolett.2c03797] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Using the ultraviolet autofluorescence of tryptophan amino acids offers fascinating perspectives to study single proteins without the drawbacks of fluorescence labeling. However, the low autofluorescence signals have so far limited the UV detection to large proteins containing several tens of tryptophan residues. This limit is not compatible with the vast majority of proteins which contain only a few tryptophans. Here we push the sensitivity of label-free ultraviolet fluorescence correlation spectroscopy (UV-FCS) down to the single tryptophan level. Our results show how the combination of nanophotonic plasmonic antennas, antioxidants, and background reduction techniques can improve the signal-to-background ratio by over an order of magnitude and enable UV-FCS on thermonuclease proteins with a single tryptophan residue. This sensitivity breakthrough unlocks the applicability of UV-FCS technique to a broad library of label-free proteins.
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Affiliation(s)
- Prithu Roy
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, AMUTech, 13013 Marseille, France
| | - Jean-Benoît Claude
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, AMUTech, 13013 Marseille, France
| | - Sunny Tiwari
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, AMUTech, 13013 Marseille, France
| | - Aleksandr Barulin
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, AMUTech, 13013 Marseille, France
| | - Jérôme Wenger
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, AMUTech, 13013 Marseille, France
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6
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Fennelly M, Hellebust S, Wenger J, O'Connor D, Griffith GW, Plant BJ, Prentice MB. Portable HEPA filtration successfully augments natural-ventilation-mediated airborne particle clearance in a legacy design hospital ward. J Hosp Infect 2023; 131:54-57. [PMID: 36198345 PMCID: PMC9526867 DOI: 10.1016/j.jhin.2022.09.017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2022] [Revised: 09/23/2022] [Accepted: 09/26/2022] [Indexed: 01/25/2023]
Abstract
As the severe acute respiratory syndrome coronavirus-2 pandemic has proceeded, ventilation has been recognized increasingly as an important tool in infection control. Many hospitals in Ireland and the UK do not have mechanical ventilation and depend on natural ventilation. The effectiveness of natural ventilation varies with atmospheric conditions and building design. In a challenge test of a legacy design ward, this study showed that portable air filtration significantly increased the clearance of pollutant aerosols of respirable size compared with natural ventilation, and reduced spatial variation in particle persistence. A combination of natural ventilation and portable air filtration is significantly more effective for particle clearance than either intervention alone.
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Affiliation(s)
- M Fennelly
- School of Chemistry and Environmental Research Institute, University College Cork, Cork, Ireland; Department of Pathology, University College Cork, Cork, Ireland; School of Chemical and Pharmaceutical Sciences, Technological University Dublin, Dublin, Ireland.
| | - S Hellebust
- School of Chemistry and Environmental Research Institute, University College Cork, Cork, Ireland
| | - J Wenger
- School of Chemistry and Environmental Research Institute, University College Cork, Cork, Ireland
| | - D O'Connor
- School of Chemical Sciences, Dublin City University, Dublin, Ireland
| | - G W Griffith
- Department of Life Sciences, Aberystwyth University, Aberystwyth, UK
| | - B J Plant
- Adult Cystic Fibrosis Centre, Cork University Hospital, University College Cork, Cork, Ireland
| | - M B Prentice
- Department of Pathology, University College Cork, Cork, Ireland; APC Microbiome Institute, University College Cork, Cork, Ireland.
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7
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Nüesch MF, Ivanović MT, Claude JB, Nettels D, Best RB, Wenger J, Schuler B. Single-molecule Detection of Ultrafast Biomolecular Dynamics with Nanophotonics. J Am Chem Soc 2021; 144:52-56. [PMID: 34970909 DOI: 10.1021/jacs.1c09387] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Single-molecule Förster resonance energy transfer (FRET) is a versatile technique for probing the structure and dynamics of biomolecules even in heterogeneous ensembles. However, because of the limited fluorescence brightness per molecule and the relatively long fluorescence lifetimes, probing ultrafast structural dynamics in the nanosecond time scale has thus far been very challenging. Here, we demonstrate that nanophotonic fluorescence enhancement in zero-mode waveguides enables measurements of previously inaccessible low-nanosecond dynamics by dramatically improving time resolution and reduces data acquisition times by more than an order of magnitude. As a prototypical example, we use this approach to probe the dynamics of a short intrinsically disordered peptide that were previously inaccessible with single-molecule FRET measurements. We show that we are now able to detect the low-nanosecond correlations in this peptide, and we obtain a detailed interpretation of the underlying distance distributions and dynamics in conjunction with all-atom molecular dynamics simulations, which agree remarkably well with the experiments. We expect this combined approach to be widely applicable to the investigation of very rapid biomolecular dynamics.
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Affiliation(s)
- Mark F Nüesch
- Department of Biochemistry, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland
| | - Miloš T Ivanović
- Department of Biochemistry, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland
| | - Jean-Benoît Claude
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, 13013 Marseille, France
| | - Daniel Nettels
- Department of Biochemistry, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland
| | - Robert B Best
- Laboratory of Chemical Physics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892-0520, United States
| | - Jérôme Wenger
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, 13013 Marseille, France
| | - Benjamin Schuler
- Department of Biochemistry, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland.,Department of Physics, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland
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8
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Abstract
Single photon sources with high brightness and subnanosecond lifetimes are key components for quantum technologies. Optical nanoantennas can enhance the emission properties of single quantum emitters, but this approach requires accurate nanoscale positioning of the source at the plasmonic hotspot. Here, we use plasmonic nanoantennas to simultaneously trap single colloidal quantum dots and enhance their photoluminescence. The nano-optical trapping automatically locates the quantum emitter at the nanoantenna hotspot without further processing. Our dedicated nanoantenna design achieves a high trap stiffness of 0.6 (fN/nm)/mW for quantum dot trapping, together with a relatively low trapping power of 2 mW/μm2. The emission from the nanoantenna-trapped single quantum dot shows 7× increased brightness, 50× reduced blinking, 2× shortened lifetime, and a clear antibunching below 0.5 demonstrating true single photon emission. Combining nano-optical tweezers with plasmonic enhancement is a promising route for quantum technologies and spectroscopy of single nano-objects.
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Affiliation(s)
- Quanbo Jiang
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, AMUTech, 13013 Marseille, France
| | - Prithu Roy
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, AMUTech, 13013 Marseille, France
| | - Jean-Benoît Claude
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, AMUTech, 13013 Marseille, France
| | - Jérôme Wenger
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, AMUTech, 13013 Marseille, France
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9
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Jiang Q, Claude JB, Wenger J. Plasmonic nano-optical trap stiffness measurements and design optimization. Nanoscale 2021; 13:4188-4194. [PMID: 33576761 DOI: 10.1039/d0nr08635e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Plasmonic nano-optical tweezers enable the non-invasive manipulation of nano-objects under low illumination intensities, and have become a powerful tool for nanotechnology and biophysics. However, measuring the trap stiffness of nanotweezers remains a complicated task, which hinders the development of plasmonic trapping. Here, we describe an experimental method to measure the trap stiffness based on the temporal correlation of the fluorescence from the trapped object. The method is applied to characterize the trap stiffness in different double nanohole apertures and explore the influence of their design parameters in relationship with numerical simulations. Optimizing the double nanohole design achieves a trap stiffness 10× larger than the previous state-of-the-art. The experimental method and the design guidelines discussed here offer a simple and efficient way to improve the performance of nano-optical tweezers.
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Affiliation(s)
- Quanbo Jiang
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, 13013 Marseille, France.
| | - Jean-Benoît Claude
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, 13013 Marseille, France.
| | - Jérôme Wenger
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, 13013 Marseille, France.
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10
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Jiang Q, Rogez B, Claude JB, Baffou G, Wenger J. Quantifying the Role of the Surfactant and the Thermophoretic Force in Plasmonic Nano-optical Trapping. Nano Lett 2020; 20:8811-8817. [PMID: 33237789 DOI: 10.1021/acs.nanolett.0c03638] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Plasmonic nanotweezers use intense electric field gradients to generate optical forces able to trap nano-objects in liquids. However, part of the incident light is absorbed into the metal, and a supplementary thermophoretic force acting on the nano-object arises from the resulting temperature gradient. Plasmonic nanotweezers thus face the challenge of disentangling the intricate contributions of the optical and thermophoretic forces. Here, we show that commonly added surfactants can unexpectedly impact the trap performance by acting on the thermophilic or thermophobic response of the nano-object. Using different surfactants in double nanohole plasmonic trapping experiments, we measure and compare the contributions of the thermophoretic and the optical forces, evidencing a trap stiffness 20× higher using sodium dodecyl sulfate (SDS) as compared to Triton X-100. This work uncovers an important mechanism in plasmonic nanotweezers and provides guidelines to control and optimize the trap performance for different plasmonic designs.
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Affiliation(s)
- Quanbo Jiang
- Aix Marseille Université, CNRS, Centrale Marseille, Institut Fresnel, 13013 Marseille, France
| | - Benoît Rogez
- Aix Marseille Université, CNRS, Centrale Marseille, Institut Fresnel, 13013 Marseille, France
| | - Jean-Benoît Claude
- Aix Marseille Université, CNRS, Centrale Marseille, Institut Fresnel, 13013 Marseille, France
| | - Guillaume Baffou
- Aix Marseille Université, CNRS, Centrale Marseille, Institut Fresnel, 13013 Marseille, France
| | - Jérôme Wenger
- Aix Marseille Université, CNRS, Centrale Marseille, Institut Fresnel, 13013 Marseille, France
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11
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Toliopoulos D, Khoury M, Bouabdellaoui M, Granchi N, Claude JB, Benali A, Berbezier I, Hannani D, Ronda A, Wenger J, Bollani M, Gurioli M, Sanguinetti S, Intonti F, Abbarchi M. Fabrication of spectrally sharp Si-based dielectric resonators: combining etaloning with Mie resonances. Opt Express 2020; 28:37734-37742. [PMID: 33379602 DOI: 10.1364/oe.409001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2020] [Accepted: 10/18/2020] [Indexed: 06/12/2023]
Abstract
We use low-resolution optical lithography joined with solid state dewetting of crystalline, ultra-thin silicon on insulator (c-UT-SOI) to form monocrystalline, atomically smooth, silicon-based Mie resonators in well-controlled large periodic arrays. The dewetted islands have a typical size in the 100 nm range, about one order of magnitude smaller than the etching resolution. Exploiting a 2 µm thick SiO2 layer separating the islands and the underlying bulk silicon wafer, we combine the resonant modes of the antennas with the etalon effect. This approach sets the resonance spectral position and improves the structural colorization and the contrast between scattering maxima and minima of individual resonant antennas. Our results demonstrate that templated dewetting enables the formation of defect-free, faceted islands that are much smaller than the nominal etching resolution and that an appropriate engineering of the substrate improves their scattering properties. These results are relevant to applications in spectral filtering, structural color and beam steering with all-dielectric photonic devices.
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12
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Baibakov M, Barulin A, Roy P, Claude JB, Patra S, Wenger J. Zero-mode waveguides can be made better: fluorescence enhancement with rectangular aluminum nanoapertures from the visible to the deep ultraviolet. Nanoscale Adv 2020; 2:4153-4160. [PMID: 36132755 PMCID: PMC9417158 DOI: 10.1039/d0na00366b] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Accepted: 07/20/2020] [Indexed: 05/25/2023]
Abstract
Nanoapertures milled in metallic films called zero-mode waveguides (ZMWs) overcome the limitations of classical confocal microscopes by enabling single molecule analysis at micromolar concentrations with improved fluorescence brightness. While the ZMWs have found many applications in single molecule fluorescence studies, their shape has been mainly limited to be circular. Owing to the large parameter space to explore and the lack of guidelines, earlier attempts using more elaborate shapes have led to unclear conclusions whether or not the performance was improved as compared to a circular ZMW. Here, we comparatively analyze the performance of rectangular-shaped nanoapertures milled in aluminum to enhance the fluorescence emission rate of single molecules from the near infrared to the deep ultraviolet. Our new design is based on rational principles taking maximum advantage of the laser linear polarization. While the long edge of the nanorectangle is set to meet the cut-off size for the propagation of light into the nanoaperture, the short edge is reduced to 30 nm to accelerate the photodynamics while maintaining bright fluorescence rates. Our results show that both in the red and in the ultraviolet, the nanorectangles provide 50% brighter photon count rates as compared to the best performing circular ZMWs and achieve fluorescence lifetimes shorter than 300 ps. These findings can be readily used to improve the performance of ZMWs, especially for fast biomolecular dynamics, bright single-photon sources, and ultraviolet plasmonics.
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Affiliation(s)
- Mikhail Baibakov
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel 13013 Marseille France
| | - Aleksandr Barulin
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel 13013 Marseille France
| | - Prithu Roy
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel 13013 Marseille France
| | - Jean-Benoît Claude
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel 13013 Marseille France
| | - Satyajit Patra
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel 13013 Marseille France
| | - Jérôme Wenger
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel 13013 Marseille France
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13
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Kourtchev I, Szeto P, O'Connor I, Popoola OAM, Maenhaut W, Wenger J, Kalberer M. Comparison of Heated Electrospray Ionization and Nanoelectrospray Ionization Sources Coupled to Ultra-High-Resolution Mass Spectrometry for Analysis of Highly Complex Atmospheric Aerosol Samples. Anal Chem 2020; 92:8396-8403. [PMID: 32394709 DOI: 10.1021/acs.analchem.0c00971] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Direct infusion analysis using soft ionization techniques coupled to ultra-high-resolution mass spectrometers (UHRMS) allows screening of thousands of organic species in complex samples. Despite the high analytical throughput of direct infusion, this technique is known to be prone to matrix effects caused by changes in the ionization efficiency of an analyte, ion suppression, or enhancement due to the presence of certain compounds and inorganic salts in the sample. In this study we compared two soft ionization sources, that is, heated electrospray ionization (HESI) and nano-ESI for the analysis of atmospheric aerosol samples in the negative ionization mode. In-source fragmentation tests were conducted and experiments involving sample desalting through solid-phase extraction (SPE) with a reversed phase functionalized polymeric sorbent and spiking samples with inorganic salt were performed. Both ionization sources showed specific advantages and disadvantages for the direct infusion analysis of atmospheric aerosol extracts. The mass spectra of aerosol samples analyzed using HESI contained a large number of high molecular weight homologues containing sulfur and nitrogen, suggesting that this source is prone to formation of salt adducts and noncovalent compounds in samples enriched with inorganic salts. Data from the same aerosol sample extracts analyzed using nanoelectrospray ionization (nano-ESI) show less adduct formation; however, a decrease in the number of homologues was observed, as well as loss of molecules at higher mass range, indicating that the nano-ESI source is more prone to ion suppression. Irrespective of ionization source, SPE pretreatment significantly improved ion recoveries for organic species with nonpolar and moderately polar functional groups, but lower recoveries were obtained for highly oxygenated molecules. Therefore, while SPE reduced in-source adduct formation, it also limited the range of compounds identified through a single analysis.
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Affiliation(s)
- I Kourtchev
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K
| | - P Szeto
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K
| | - I O'Connor
- School of Chemistry and Environmental Research Institute, University College Cork, College Road, Cork T12 K8AF, Ireland
| | - O A M Popoola
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K
| | - W Maenhaut
- Department of Chemistry, Ghent University, Krijgslaan 281, S12, Ghent 9000, Belgium
| | - J Wenger
- School of Chemistry and Environmental Research Institute, University College Cork, College Road, Cork T12 K8AF, Ireland
| | - M Kalberer
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K.,Department of Environmental Sciences, University of Basel, Klingelbergstrasse 27, Basel 4056, Switzerland
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14
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Baibakov M, Patra S, Claude JB, Wenger J. Long-Range Single-Molecule Förster Resonance Energy Transfer between Alexa Dyes in Zero-Mode Waveguides. ACS Omega 2020; 5:6947-6955. [PMID: 32258931 PMCID: PMC7114734 DOI: 10.1021/acsomega.0c00322] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/23/2020] [Accepted: 03/05/2020] [Indexed: 06/11/2023]
Abstract
Zero-mode waveguide (ZMW) nano-apertures milled in metal films were proposed to improve the Förster resonance energy transfer (FRET) efficiency and enable single-molecule FRET detection beyond the 10 nm barrier, overcoming the restrictions of diffraction-limited detection in a homogeneous medium. However, the earlier ZMW demonstrations were limited to the Atto 550-Atto 647N fluorophore pair, asking the question whether the FRET enhancement observation was an artifact related to this specific set of fluorescent dyes. Here, we use Alexa Fluor 546 and Alexa Fluor 647 to investigate single-molecule FRET at large donor-acceptor separations exceeding 10 nm inside ZMWs. These Alexa fluorescent dyes feature a markedly different chemical structure, surface charge, and hydrophobicity as compared to their Atto counterparts. Our single molecule data on Alexa 546-Alexa 647 demonstrate enhanced FRET efficiencies at large separations exceeding 10 nm, extending the spatial range available for FRET and confirming the earlier conclusions. By showing that the FRET enhancement inside a ZMW does not depend on the set of fluorescent dyes, this report is an important step to establish the relevance of ZMWs to extend the sensitivity and detection range of FRET, while preserving its ability to work on regular fluorescent dye pairs.
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Affiliation(s)
- Mikhail Baibakov
- Aix Marseille Univ, CNRS, Centrale
Marseille, Institut Fresnel, 13013 Marseille, France
| | - Satyajit Patra
- Aix Marseille Univ, CNRS, Centrale
Marseille, Institut Fresnel, 13013 Marseille, France
| | - Jean-Benoît Claude
- Aix Marseille Univ, CNRS, Centrale
Marseille, Institut Fresnel, 13013 Marseille, France
| | - Jérôme Wenger
- Aix Marseille Univ, CNRS, Centrale
Marseille, Institut Fresnel, 13013 Marseille, France
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15
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Patra S, Baibakov M, Claude JB, Wenger J. Surface passivation of zero-mode waveguide nanostructures: benchmarking protocols and fluorescent labels. Sci Rep 2020; 10:5235. [PMID: 32251328 PMCID: PMC7089978 DOI: 10.1038/s41598-020-61856-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2019] [Accepted: 12/19/2019] [Indexed: 11/10/2022] Open
Abstract
Zero mode waveguide (ZMW) nanoapertures efficiently confine the light down to the nanometer scale and overcome the diffraction limit in single molecule fluorescence analysis. However, unwanted adhesion of the fluorescent molecules on the ZMW surface can severely hamper the experiments. Therefore a proper surface passivation is required for ZMWs, but information is currently lacking on both the nature of the adhesion phenomenon and the optimization of the different passivation protocols. Here we monitor the influence of the fluorescent dye (Alexa Fluor 546 and 647, Atto 550 and 647N) on the non-specific adhesion of double stranded DNA molecule. We show that the nonspecific adhesion of DNA double strands onto the ZMW surface is directly mediated by the organic fluorescent dye being used, as Atto 550 and Atto 647N show a pronounced tendency to adhere to the ZMW while the Alexa Fluor 546 and 647 are remarkably free of this effect. Despite the small size of the fluorescent label, the surface charge and hydrophobicity of the dye appear to play a key role in promoting the DNA affinity for the ZMW surface. Next, different surface passivation methods (bovine serum albumin BSA, polyethylene glycol PEG, polyvinylphosphonic acid PVPA) are quantitatively benchmarked by fluorescence correlation spectroscopy to determine the most efficient approaches to prevent the adsorption of Atto 647N labeled DNA. Protocols using PVPA and PEG-silane of 1000 Da molar mass are found to drastically avoid the non-specific adsorption into ZMWs. Optimizing both the choice of the fluorescent dye and the surface passivation protocol are highly significant to expand the use of ZMWs for single molecule fluorescence applications.
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Affiliation(s)
- Satyajit Patra
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, 13013, Marseille, France
| | - Mikhail Baibakov
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, 13013, Marseille, France
| | - Jean-Benoît Claude
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, 13013, Marseille, France
| | - Jérôme Wenger
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, 13013, Marseille, France.
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16
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Abstract
The poor photostability and low brightness of protein autofluorescence have been major limitations preventing the detection of label-free proteins at the single-molecule level. Overcoming these issues, we report here a strategy to promote the photostability of proteins and use their natural tryptophan autofluorescence in the ultraviolet (UV) for fluorescence correlation spectroscopy (FCS). Combining enzymatic oxygen scavengers with antioxidants and triplet-state quenchers greatly promotes the protein photostability, reduces the photobleaching probability, and improves the net autofluorescence detection rate. Our results show that the underlying photochemical concepts initially derived for organic visible fluorescent dyes are quite general. Using this approach, we achieved UV fluorescence correlation spectroscopy on label-free streptavidin proteins containing only 24 tryptophan residues, 6.5× fewer than the current state-of-the-art. This strategy greatly extends the possibility of detecting single label-free proteins with the versatility of single-molecule fluorescence without requiring the presence of a potentially disturbing external fluorescent marker. It also opens new perspectives to improve the UV durability of organic devices.
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Affiliation(s)
- Aleksandr Barulin
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, 13013 Marseille, France
| | - Jérôme Wenger
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, 13013 Marseille, France
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17
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Jiang Q, Rogez B, Claude JB, Moreau A, Lumeau J, Baffou G, Wenger J. Adhesion layer influence on controlling the local temperature in plasmonic gold nanoholes. Nanoscale 2020; 12:2524-2531. [PMID: 31930256 DOI: 10.1039/c9nr08113e] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Gold films do not adhere well on glass substrates, so plasmonics experiments typically use a thin adhesion layer of titanium or chromium to ensure a proper adhesion between the gold film and the glass substrate. While the absorption of light into gold structures is largely used to generate heat and control the temperature at the nanoscale, the influence of the adhesion layer on this process is largely overlooked. Here, we quantify the role of the adhesion layer in determining the local temperature increase around a single nanohole illuminated by a focused infrared laser. Despite their nanometer thickness, adhesion layers can absorb a greater fraction of the incoming infrared light than the 100 nm thick gold layer leading to a significant increase of the local temperature. Different experimental designs are explored, offering new ways to promote or avoid the temperature increase inside nanoapertures. This knowledge further expands the plasmonic toolbox for temperature-controlled experiments including single molecule sensing, nanopore translocation, polymerization, or nano-optical trapping.
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Affiliation(s)
- Quanbo Jiang
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, 13013 Marseille, France.
| | - Benoît Rogez
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, 13013 Marseille, France.
| | - Jean-Benoît Claude
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, 13013 Marseille, France.
| | - Antonin Moreau
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, 13013 Marseille, France.
| | - Julien Lumeau
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, 13013 Marseille, France.
| | - Guillaume Baffou
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, 13013 Marseille, France.
| | - Jérôme Wenger
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, 13013 Marseille, France.
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18
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Palmer IS, Thiex N, Allen R, Alley E, Anderson N, Bell J, Carpenter N, Cunningham W, Deuschle L, Kane P, Marts R, Rottinghaus G, Rutta S, Torma L, Vindiola A, Wenger J, Whanger P, Williams A, Wo C. Determination of Selenium in Feeds and Premixes: Collaborative Study. J AOAC Int 2020. [DOI: 10.1093/jaoac/80.3.469] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
Abstract
A total of 17 laboratories participated in a collaborative study for the determination of selenium in feeds and premixes using either a fluorometric or a continuous hydride generation atomic absorption (HGAA) method. Each collaborator analyzed 16 blind duplicate samples of feed and premixes from various feed manufacturers. The amount of Se in these materials ranged from 0.2 to 5500 μg/g. Six laboratories used only the fluorometric procedure, 8 laboratories used only the hydride generation atomic absorption procedure, and 3 laboratories used both procedures. One laboratory in the fluorometric study and 3 laboratories in the HGAA study were initially excluded because of invalid data. Poor agreement between the blind duplicates indicated probable sample interchange and/or dilution error. The data from 8 laboratories were submitted to statistical analysis, including data from 2 laboratories participating in both studies. The repeatability standard deviation (RSDr) for samples analyzed by the fluorometric procedure ranged from 5.9 to 33%, and the reproducibility standard deviation (RSDR) ranged from 12 to 33%. RSDf for samples analyzed by HGAA ranged from 2.8 to 18%, and RSDR ranged from 4.0 to 36%. Both fluorometric and continuous hydride generation atomic absorption methods for the determination of Se in feeds and premixes have been adopted first action by AOAC INTERNATIONAL.
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Affiliation(s)
- Ivan S Palmer
- South Dakota State University, Department of Chemistry and Biochemistry, Brookings, SD 57007
| | - Nancy Thiex
- South Dakota State University, Department of Chemistry and Biochemistry, Brookings, SD 57007
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19
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Marcia King B, Joseph G. S, Anthony C, Coleman P, Cottingham B, Culmo R, Curtis R, Dingman L, Johnson R, Lehman G, Loughran J, Martinez S, Moody J, Paisley C, Radloff H, John AS, Schrader E, Sizemore J, Wenger J, White G. Combustion Method for Determination of Crude Protein in Meat and Meat Products: Collaborative Study. J AOAC Int 2020. [DOI: 10.1093/jaoac/76.4.787] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
Abstract
Twelve laboratories participated in a collaborative study to compare a combustion method with the AOAC mercury catalyst Kjeldahl method (928.08) for the determination of crude protein in meat and meat products. Three different combustion instruments were used; consequently, the combustion method for this study is written in generic terms describing the principle, the apparatus specifications, and the performance requirements needed. Fifteen sample pairs were used for the study; each pair consisted of the same commercial meat product from each of 2 different manufacturers. Protein content of all samples ranged from about 10 to 20%. In addition, nicotinic acid and lysine monohydrochloride were used as standards to assess combustion equipment performance. All laboratories and all instruments performed the combustion method satisfactorily on the basis of results for the standards. For the meat samples, repeatability standard deviations (sr) ranged from 0.11 to 0.40 for the Kjeldahl method and from 0.12 to 0.41 for the combustion method; the repeatability relative standard deviations (RSDr) ranged from 0.82 to 2.41% and from 0.60 to 2.23% for the Kjeldahl and combustion methods, respectively. Reproducibility standard deviations (SR) ranged from 0.20 to 0.49 for the Kjeldahl method and from 0.18 to 0.46 for the combustion method, whereas the reproducibility relative standard deviations (RSDR) ranged from 1.59 to 2.84% for the Kjeldahl method and from 1.32 to 3.35% for the combustion method. Overall grand means were 15.59% protein for the Kjeldahl method and 15.75% protein for the combustion method. The combustion method was adopted first action by AOAC International.
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20
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Barulin A, Claude JB, Patra S, Bonod N, Wenger J. Deep Ultraviolet Plasmonic Enhancement of Single Protein Autofluorescence in Zero-Mode Waveguides. Nano Lett 2019; 19:7434-7442. [PMID: 31526002 DOI: 10.1021/acs.nanolett.9b03137] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Single molecule detection provides detailed information about molecular structures and functions but it generally requires the presence of a fluorescent marker which can interfere with the activity of the target molecule or complicate the sample production. Detecting a single protein with its natural UV autofluorescence is an attractive approach to avoid all the issues related to fluorescence labeling. However, the UV autofluorescence signal from a single protein is generally extremely weak. Here, we use aluminum plasmonics to enhance the tryptophan autofluorescence emission of single proteins in the UV range. Zero-mode waveguide nanoapertures enable the observation of the UV fluorescence of single label-free β-galactosidase proteins with increased brightness, microsecond transit times, and operation at micromolar concentrations. We demonstrate quantitative measurements of the local concentration, diffusion coefficient, and hydrodynamic radius of the label-free protein over a broad range of zero-mode waveguide diameters. Although the plasmonic fluorescence enhancement has generated a tremendous interest in the visible and near-infrared parts of the spectrum, this work pushes further the limits of plasmonic-enhanced single molecule detection into the UV range and constitutes a major step forward in our ability to interrogate single proteins in their native state at physiological concentrations.
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Affiliation(s)
- Aleksandr Barulin
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel , 13013 Marseille , France
| | - Jean-Benoît Claude
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel , 13013 Marseille , France
| | - Satyajit Patra
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel , 13013 Marseille , France
| | - Nicolas Bonod
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel , 13013 Marseille , France
| | - Jérôme Wenger
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel , 13013 Marseille , France
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21
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Abstract
Aluminum can sustain plasmonic resonances down into the ultraviolet (UV) range to promote surface-enhanced spectroscopy and catalysis. Despite its natural alumina passivating layer, we find here that under 266 nm pulsed UV illumination, aluminum can undergo a dramatic photocorrosion in water within a few tens of seconds and even at low average UV powers. This aluminum instability in water environments is a critical limitation. We show that the aluminum photocorrosion is related to the nonlinear absorption by water in the UV range leading to the production of hydroxyl radicals. Different corrosion protection approaches are tested using scavengers for reactive oxygen species and polymer layers deposited on top of the aluminum structures. Using optimized protection, we achieve a 10-fold increase in the available UV power range leading to no visible photocorrosion effects. This technique is crucial to achieve stable use of aluminum nanostructures enabling UV plasmonics in aqueous solutions.
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Affiliation(s)
- Aleksandr Barulin
- Aix Marseille Univ, CNRS, Centrale Marseille , Institut Fresnel , 13013 Marseille , France
| | - Jean-Benoît Claude
- Aix Marseille Univ, CNRS, Centrale Marseille , Institut Fresnel , 13013 Marseille , France
| | - Satyajit Patra
- Aix Marseille Univ, CNRS, Centrale Marseille , Institut Fresnel , 13013 Marseille , France
| | - Antonin Moreau
- Aix Marseille Univ, CNRS, Centrale Marseille , Institut Fresnel , 13013 Marseille , France
| | - Julien Lumeau
- Aix Marseille Univ, CNRS, Centrale Marseille , Institut Fresnel , 13013 Marseille , France
| | - Jérôme Wenger
- Aix Marseille Univ, CNRS, Centrale Marseille , Institut Fresnel , 13013 Marseille , France
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22
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Baibakov M, Patra S, Claude JB, Moreau A, Lumeau J, Wenger J. Extending Single-Molecule Förster Resonance Energy Transfer (FRET) Range beyond 10 Nanometers in Zero-Mode Waveguides. ACS Nano 2019; 13:8469-8480. [PMID: 31283186 DOI: 10.1021/acsnano.9b04378] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Single-molecule Förster resonance energy transfer (smFRET) is widely used to monitor conformations and interaction dynamics at the molecular level. However, conventional smFRET measurements are ineffective at donor-acceptor distances exceeding 10 nm, impeding the studies on biomolecules of larger size. Here, we show that zero-mode waveguide (ZMW) apertures can be used to overcome the 10 nm barrier in smFRET. Using an optimized ZMW structure, we demonstrate smFRET between standard commercial fluorophores up to 13.6 nm distance with a significantly improved FRET efficiency. To further break into the classical FRET range limit, ZMWs are combined with molecular constructs featuring multiple acceptor dyes to achieve high FRET efficiencies together with high fluorescence count rates. As we discuss general guidelines for quantitative smFRET measurements inside ZMWs, the technique can be readily applied for monitoring conformations and interactions on large molecular complexes with enhanced brightness.
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Affiliation(s)
- Mikhail Baibakov
- Aix Marseille Univ, CNRS, Centrale Marseille , Institut Fresnel , 13013 Marseille , France
| | - Satyajit Patra
- Aix Marseille Univ, CNRS, Centrale Marseille , Institut Fresnel , 13013 Marseille , France
| | - Jean-Benoît Claude
- Aix Marseille Univ, CNRS, Centrale Marseille , Institut Fresnel , 13013 Marseille , France
| | - Antonin Moreau
- Aix Marseille Univ, CNRS, Centrale Marseille , Institut Fresnel , 13013 Marseille , France
| | - Julien Lumeau
- Aix Marseille Univ, CNRS, Centrale Marseille , Institut Fresnel , 13013 Marseille , France
| | - Jérôme Wenger
- Aix Marseille Univ, CNRS, Centrale Marseille , Institut Fresnel , 13013 Marseille , France
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23
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Baibakov M, Wenger J. Laser-induced fluorescence quenching of red fluorescent dyes with green excitation: Avoiding artifacts in PIE-FRET and FCCS analysis. Chem Phys Lett 2018. [DOI: 10.1016/j.cplett.2018.06.057] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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24
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Winkler PM, Regmi R, Flauraud V, Brugger J, Rigneault H, Wenger J, García-Parajo MF. Optical Antenna-Based Fluorescence Correlation Spectroscopy to Probe the Nanoscale Dynamics of Biological Membranes. J Phys Chem Lett 2018; 9:110-119. [PMID: 29240442 DOI: 10.1021/acs.jpclett.7b02818] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
The plasma membrane of living cells is compartmentalized at multiple spatial scales ranging from the nano- to the mesoscale. This nonrandom organization is crucial for a large number of cellular functions. At the nanoscale, cell membranes organize into dynamic nanoassemblies enriched by cholesterol, sphingolipids, and certain types of proteins. Investigating these nanoassemblies known as lipid rafts is of paramount interest in fundamental cell biology. However, this goal requires simultaneous nanometer spatial precision and microsecond temporal resolution, which is beyond the reach of common microscopes. Optical antennas based on metallic nanostructures efficiently enhance and confine light into nanometer dimensions, breaching the diffraction limit of light. In this Perspective, we discuss recent progress combining optical antennas with fluorescence correlation spectroscopy (FCS) to monitor microsecond dynamics at nanoscale spatial dimensions. These new developments offer numerous opportunities to investigate lipid and protein dynamics in both mimetic and native biological membranes.
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Affiliation(s)
- Pamina M Winkler
- ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology , 08860 Barcelona, Spain
| | - Raju Regmi
- ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology , 08860 Barcelona, Spain
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel , Marseille, France
| | - Valentin Flauraud
- Microsystems Laboratory, Institute of Microengineering, Ecole Polytechnique Fédérale de Lausanne , 1015 Lausanne, Switzerland
| | - Jürgen Brugger
- Microsystems Laboratory, Institute of Microengineering, Ecole Polytechnique Fédérale de Lausanne , 1015 Lausanne, Switzerland
| | - Hervé Rigneault
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel , Marseille, France
| | - Jérôme Wenger
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel , Marseille, France
| | - María F García-Parajo
- ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology , 08860 Barcelona, Spain
- ICREA , Pg. Lluís Companys 23, 08010 Barcelona, Spain
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25
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Lombardini A, Mytskaniuk V, Sivankutty S, Andresen ER, Chen X, Wenger J, Fabert M, Joly N, Louradour F, Kudlinski A, Rigneault H. High-resolution multimodal flexible coherent Raman endoscope. Light Sci Appl 2018; 7:10. [PMID: 30839624 PMCID: PMC6107025 DOI: 10.1038/s41377-018-0003-3] [Citation(s) in RCA: 45] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2017] [Revised: 02/12/2018] [Accepted: 02/12/2018] [Indexed: 05/21/2023]
Abstract
Coherent Raman scattering microscopy is a fast, label-free, and chemically specific imaging technique that shows high potential for future in vivo optical histology. However, the imaging depth in tissues is limited to the sub-millimeter range because of absorption and scattering. Realization of coherent Raman imaging using a fiber endoscope system is a crucial step towards imaging deep inside living tissues and providing information that is inaccessible with current microscopy tools. Until now, the development of coherent Raman endoscopy has been hampered by several issues, mainly related to the fiber delivery of the excitation pulses and signal collection. Here, we present a flexible, compact, coherent Raman, and multimodal nonlinear endoscope (4.2 mm outer diameter, 71 mm rigid length) based on a resonantly scanned hollow-core Kagomé-lattice double-clad fiber. The fiber design enables distortion-less, background-free delivery of femtosecond excitation pulses and back-collection of nonlinear signals through the same fiber. Sub-micrometer spatial resolution over a large field of view is obtained by combination of a miniature objective lens with a silica microsphere lens inserted into the fiber core. We demonstrate high-resolution, high-contrast coherent anti-Stokes Raman scattering, and second harmonic generation endoscopic imaging of biological tissues over a field of view of 320 µm at a rate of 0.8 frames per second. These results pave the way for intraoperative label-free imaging applied to real-time histopathology diagnosis and surgery guidance.
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Affiliation(s)
- Alberto Lombardini
- Aix-Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, Marseille, France
| | - Vasyl Mytskaniuk
- Aix-Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, Marseille, France
| | - Siddharth Sivankutty
- Aix-Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, Marseille, France
| | - Esben Ravn Andresen
- Aix-Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, Marseille, France
- Laboratoire de Physique des Lasers Atomes et Molécules, UMR 8523, CNRS, Université Lille, 59000 Lille, France
| | - Xueqin Chen
- Aix-Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, Marseille, France
| | - Jérôme Wenger
- Aix-Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, Marseille, France
| | - Marc Fabert
- CNRS, XLIM, UMR 7252, Université de Limoges, 87060 Limoges, France
| | - Nicolas Joly
- Department of Physics, Max Planck Institute for the Science of Light, University of Erlangen Nuremberg, 91058 Erlangen, Germany
| | | | - Alexandre Kudlinski
- Laboratoire de Physique des Lasers Atomes et Molécules, UMR 8523, CNRS, Université Lille, 59000 Lille, France
| | - Hervé Rigneault
- Aix-Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, Marseille, France
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26
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Regmi R, Winkler PM, Flauraud V, Borgman KJE, Manzo C, Brugger J, Rigneault H, Wenger J, García-Parajo MF. Planar Optical Nanoantennas Resolve Cholesterol-Dependent Nanoscale Heterogeneities in the Plasma Membrane of Living Cells. Nano Lett 2017; 17:6295-6302. [PMID: 28926278 DOI: 10.1021/acs.nanolett.7b02973] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Optical nanoantennas can efficiently confine light into nanoscopic hotspots, enabling single-molecule detection sensitivity at biological relevant conditions. This innovative approach to breach the diffraction limit offers a versatile platform to investigate the dynamics of individual biomolecules in living cell membranes and their partitioning into cholesterol-dependent lipid nanodomains. Here, we present optical nanoantenna arrays with accessible surface hotspots to study the characteristic diffusion dynamics of phosphoethanolamine (PE) and sphingomyelin (SM) in the plasma membrane of living cells at the nanoscale. Fluorescence burst analysis and fluorescence correlation spectroscopy performed on nanoantennas of different gap sizes show that, unlike PE, SM is transiently trapped in cholesterol-enriched nanodomains of 10 nm diameter with short characteristic times around 100 μs. The removal of cholesterol led to the free diffusion of SM, consistent with the dispersion of nanodomains. Our results are consistent with the existence of highly transient and fluctuating nanoscale assemblies enriched by cholesterol and sphingolipids in living cell membranes, also known as lipid rafts. Quantitative data on sphingolipids partitioning into lipid rafts is crucial to understand the spatiotemporal heterogeneous organization of transient molecular complexes on the membrane of living cells at the nanoscale. The proposed technique is fully biocompatible and thus provides various opportunities for biophysics and live cell research to reveal details that remain hidden in confocal diffraction-limited measurements.
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Affiliation(s)
- Raju Regmi
- ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology , 08860 Barcelona, Spain
- Aix Marseille Univ , CNRS, Centrale Marseille, Institut Fresnel, Marseille, France
| | - Pamina M Winkler
- ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology , 08860 Barcelona, Spain
| | - Valentin Flauraud
- Microsystems Laboratory, Institute of Microengineering, Ecole Polytechnique Fédérale de Lausanne , 1015 Lausanne, Switzerland
| | - Kyra J E Borgman
- ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology , 08860 Barcelona, Spain
| | - Carlo Manzo
- ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology , 08860 Barcelona, Spain
| | - Jürgen Brugger
- Microsystems Laboratory, Institute of Microengineering, Ecole Polytechnique Fédérale de Lausanne , 1015 Lausanne, Switzerland
| | - Hervé Rigneault
- Aix Marseille Univ , CNRS, Centrale Marseille, Institut Fresnel, Marseille, France
| | - Jérôme Wenger
- Aix Marseille Univ , CNRS, Centrale Marseille, Institut Fresnel, Marseille, France
| | - María F García-Parajo
- ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology , 08860 Barcelona, Spain
- ICREA , Pg. Lluı́s Companys 23, 08010 Barcelona, Spain
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Winkler PM, Regmi R, Flauraud V, Brugger J, Rigneault H, Wenger J, García-Parajo MF. Transient Nanoscopic Phase Separation in Biological Lipid Membranes Resolved by Planar Plasmonic Antennas. ACS Nano 2017; 11:7241-7250. [PMID: 28696660 DOI: 10.1021/acsnano.7b03177] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Nanoscale membrane assemblies of sphingolipids, cholesterol, and certain proteins, also known as lipid rafts, play a crucial role in facilitating a broad range of important cell functions. Whereas on living cell membranes lipid rafts have been postulated to have nanoscopic dimensions and to be highly transient, the existence of a similar type of dynamic nanodomains in multicomponent lipid bilayers has been questioned. Here, we perform fluorescence correlation spectroscopy on planar plasmonic antenna arrays with different nanogap sizes to assess the dynamic nanoscale organization of mimetic biological membranes. Our approach takes advantage of the highly enhanced and confined excitation light provided by the nanoantennas together with their outstanding planarity to investigate membrane regions as small as 10 nm in size with microsecond time resolution. Our diffusion data are consistent with the coexistence of transient nanoscopic domains in both the liquid-ordered and the liquid-disordered microscopic phases of multicomponent lipid bilayers. These nanodomains have characteristic residence times between 30 and 150 μs and sizes around 10 nm, as inferred from the diffusion data. Thus, although microscale phase separation occurs on mimetic membranes, nanoscopic domains also coexist, suggesting that these transient assemblies might be similar to those occurring in living cells, which in the absence of raft-stabilizing proteins are poised to be short-lived. Importantly, our work underscores the high potential of photonic nanoantennas to interrogate the nanoscale heterogeneity of native biological membranes with ultrahigh spatiotemporal resolution.
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Affiliation(s)
- Pamina M Winkler
- Institut de Ciencies Fotoniques (ICFO), The Barcelona Institute of Science and Technology , Barcelona, Spain
| | - Raju Regmi
- Institut de Ciencies Fotoniques (ICFO), The Barcelona Institute of Science and Technology , Barcelona, Spain
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel , Marseille, France
| | - Valentin Flauraud
- Microsystems Laboratory, Institute of Microengineering, Ecole Polytechnique Fédérale de Lausanne , 1015 Lausanne, Switzerland
| | - Jürgen Brugger
- Microsystems Laboratory, Institute of Microengineering, Ecole Polytechnique Fédérale de Lausanne , 1015 Lausanne, Switzerland
| | - Hervé Rigneault
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel , Marseille, France
| | - Jérôme Wenger
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel , Marseille, France
| | - María F García-Parajo
- Institut de Ciencies Fotoniques (ICFO), The Barcelona Institute of Science and Technology , Barcelona, Spain
- ICREA , Pg. Lluís Companys 23, 08010 Barcelona, Spain
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28
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Flauraud V, Regmi R, Winkler PM, Alexander DTL, Rigneault H, van Hulst NF, García-Parajo MF, Wenger J, Brugger J. In-Plane Plasmonic Antenna Arrays with Surface Nanogaps for Giant Fluorescence Enhancement. Nano Lett 2017; 17:1703-1710. [PMID: 28182429 DOI: 10.1021/acs.nanolett.6b04978] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Optical nanoantennas have a great potential for enhancing light-matter interactions at the nanometer scale, yet fabrication accuracy and lack of scalability currently limit ultimate antenna performance and applications. In most designs, the region of maximum field localization and enhancement (i.e., hotspot) is not readily accessible to the sample because it is buried into the nanostructure. Moreover, current large-scale fabrication techniques lack reproducible geometrical control below 20 nm. Here, we describe a new nanofabrication technique that applies planarization, etch back, and template stripping to expose the excitation hotspot at the surface, providing a major improvement over conventional electron beam lithography methods. We present large flat surface arrays of in-plane nanoantennas, featuring gaps as small as 10 nm with sharp edges, excellent reproducibility and full surface accessibility of the hotspot confined region. The novel fabrication approach drastically improves the optical performance of plasmonic nanoantennas to yield giant fluorescence enhancement factors up to 104-105 times, together with nanoscale detection volumes in the 20 zL range. The method is fully scalable and adaptable to a wide range of antenna designs. We foresee broad applications by the use of these in-plane antenna geometries ranging from large-scale ultrasensitive sensor chips to microfluidics and live cell membrane investigations.
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Affiliation(s)
- Valentin Flauraud
- Microsystems Laboratory, Institute of Microengineering, Ecole Polytechnique Fédérale de Lausanne , 1015 Lausanne, Switzerland
| | - Raju Regmi
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, F-13013 Marseille, France
- ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, 08860 Castelldefels (Barcelona), Spain
| | - Pamina M Winkler
- ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, 08860 Castelldefels (Barcelona), Spain
| | - Duncan T L Alexander
- Interdisciplinary Center for Electron Microscopy (CIME) Ecole Polytechnique Fédérale de Lausanne , 1015 Lausanne, Switzerland
| | - Hervé Rigneault
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, F-13013 Marseille, France
| | - Niek F van Hulst
- ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, 08860 Castelldefels (Barcelona), Spain
- ICREA , Pg. Lluís Companys 23, 08010 Barcelona, Spain
| | - María F García-Parajo
- ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, 08860 Castelldefels (Barcelona), Spain
- ICREA , Pg. Lluís Companys 23, 08010 Barcelona, Spain
| | - Jérôme Wenger
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, F-13013 Marseille, France
| | - Jürgen Brugger
- Microsystems Laboratory, Institute of Microengineering, Ecole Polytechnique Fédérale de Lausanne , 1015 Lausanne, Switzerland
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29
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Vial S, Berrahal Y, Prado M, Wenger J. Single-Step DNA Detection Assay Monitoring Dual-Color Light Scattering from Individual Metal Nanoparticle Aggregates. ACS Sens 2017; 2:251-256. [PMID: 28261666 PMCID: PMC5329769 DOI: 10.1021/acssensors.6b00737] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2016] [Accepted: 01/23/2017] [Indexed: 02/07/2023]
Abstract
![]()
Efficiently detecting
DNA sequences within a limited time is vital
for disease screening and public health monitoring. This calls for
a new method that combines high sensitivity, fast read-out time, and
easy manipulation of the sample, avoiding the extensive steps of DNA
amplification, purification, or grafting to a surface. Here, we introduce
photon cross-correlation spectroscopy as a new method for specific
DNA sensing with high sensitivity in a single-step homogeneous solution
phase. Our approach is based on confocal dual-color illumination and
detection of the scattering intensities from individual silver nanoparticles
and gold nanorods. In the absence of the target DNA, the nanoparticles
move independently and their respective scattering signals are uncorrelated.
In the presence of the target DNA, the probe-functionalized gold and
silver nanoparticles assemble via DNA hybridization with the target,
giving rise to temporal coincidence between the signals scattered
by each nanoparticle. The degree of coincidence accurately quantifies
the amount of target DNA. To demonstrate the efficiency of our technique,
we detect a specific DNA sequence of sesame, an allergenic food ingredient,
for a range of concentration from 5 pM to 1.5 nM with a limit of detection
of 1 pM. Our method is sensitive and specific enough to detect single
nucleotide deletion and mismatch. With the dual-color scattering signals
being much brighter than fluorescence-based analogs, the analysis
is fast, quantitative, and simple to operate, making it valuable for
biosensing applications.
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Affiliation(s)
- Stéphanie Vial
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, Marseille, France
| | - Youri Berrahal
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, Marseille, France
| | - Marta Prado
- International Iberian Nanotechnology Laboratory (INL) Avenida Mestre José Veiga, 4715-310, Braga, Portugal
| | - Jérôme Wenger
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, Marseille, France
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30
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Vial S, Wenger J. Single-step homogeneous immunoassay for detecting prostate-specific antigen using dual-color light scattering of metal nanoparticles. Analyst 2017; 142:3484-3491. [DOI: 10.1039/c7an01066d] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Conventional sandwich-type immunoassays are widely used for protein biomarker detection, yet their workflows are challenged by the need for multiple incubation steps separated by washing cycles.
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Affiliation(s)
- Stéphanie Vial
- Aix-Marseille Univ
- CNRS
- Centrale Marseille
- Institut Fresnel
- Marseille
| | - Jérôme Wenger
- Aix-Marseille Univ
- CNRS
- Centrale Marseille
- Institut Fresnel
- Marseille
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31
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de Torres J, Mivelle M, Moparthi SB, Rigneault H, Van Hulst NF, García-Parajó MF, Margeat E, Wenger J. Plasmonic Nanoantennas Enable Forbidden Förster Dipole-Dipole Energy Transfer and Enhance the FRET Efficiency. Nano Lett 2016; 16:6222-6230. [PMID: 27623052 DOI: 10.1021/acs.nanolett.6b02470] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Förster resonance energy transfer (FRET) plays a key role in biochemistry, organic photovoltaics, and lighting sources. FRET is commonly used as a nanoruler for the short (nanometer) distance between donor and acceptor dyes, yet FRET is equally sensitive to the mutual dipole orientation. The orientation dependence complicates the FRET analysis in biological samples and may even lead to the absence of FRET for perpendicularly oriented donor and acceptor dipoles. Here, we exploit the strongly inhomogeneous and localized fields in plasmonic nanoantennas to open new energy transfer routes, overcoming the limitations from the mutual dipole orientation to ultimately enhance the FRET efficiency. We demonstrate that the simultaneous presence of perpendicular near-field components in the nanoantenna sets favorable energy transfer routes that increase the FRET efficiency up to 50% for nearly perpendicular donor and acceptor dipoles. This new facet of plasmonic nanoantennas enables dipole-dipole energy transfer that would otherwise be forbidden in a homogeneous environment. As such, our approach further increases the applicability of single-molecule FRET over diffraction-limited approaches, with the additional benefits of higher sensitivities and higher concentration ranges toward physiological levels.
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Affiliation(s)
- Juan de Torres
- CNRS, Aix Marseille Université, Centrale Marseille, Institut Fresnel, UMR 7249, 13013Marseille, France
| | - Mathieu Mivelle
- ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology , 08860 Barcelona, Spain
| | - Satish Babu Moparthi
- CNRS, Aix Marseille Université, Centrale Marseille, Institut Fresnel, UMR 7249, 13013Marseille, France
| | - Hervé Rigneault
- CNRS, Aix Marseille Université, Centrale Marseille, Institut Fresnel, UMR 7249, 13013Marseille, France
| | - Niek F Van Hulst
- ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology , 08860 Barcelona, Spain
- ICREA , Passeig de Lluís Companys 23, 08010 Barcelona, Spain
| | - María F García-Parajó
- ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology , 08860 Barcelona, Spain
- ICREA , Passeig de Lluís Companys 23, 08010 Barcelona, Spain
| | - Emmanuel Margeat
- CNRS UMR5048, Centre de Biochimie Structurale , 29 rue de Navacelles, 34090 Montpellier, France
- INSERM U1054 , 34090 Montpellier, France
- Université Montpellier , 34090 Montpellier, France
| | - Jérôme Wenger
- CNRS, Aix Marseille Université, Centrale Marseille, Institut Fresnel, UMR 7249, 13013Marseille, France
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32
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Regmi R, Berthelot J, Winkler PM, Mivelle M, Proust J, Bedu F, Ozerov I, Begou T, Lumeau J, Rigneault H, García-Parajó MF, Bidault S, Wenger J, Bonod N. All-Dielectric Silicon Nanogap Antennas To Enhance the Fluorescence of Single Molecules. Nano Lett 2016; 16:5143-5151. [PMID: 27399057 DOI: 10.1021/acs.nanolett.6b02076] [Citation(s) in RCA: 81] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Plasmonic antennas have a profound impact on nanophotonics as they provide efficient means to manipulate light and enhance light-matter interactions at the nanoscale. However, the large absorption losses found in metals can severely limit the plasmonic applications in the visible spectral range. Here, we demonstrate the effectiveness of an alternative approach using all-dielectric nanoantennas based on silicon dimers to enhance the fluorescence detection of single molecules. The silicon antenna design is optimized to confine the near-field intensity in the 20 nm nanogap and reach a 270-fold fluorescence enhancement in a nanoscale volume of λ(3)/1800 with dielectric materials only. Our conclusions are assessed by combining polarization resolved optical spectroscopy of individual antennas, scanning electron microscopy, numerical simulations, fluorescence lifetime measurements, fluorescence burst analysis, and fluorescence correlation spectroscopy. This work demonstrates that all-silicon nanoantennas are a valid alternative to plasmonic devices for enhanced single molecule fluorescence sensing, with the additional key advantages of reduced nonradiative quenching, negligible heat generation, cost-efficiency, and complementary metal-oxide-semiconductor (CMOS) compatibility.
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Affiliation(s)
- Raju Regmi
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, Marseille, France
- ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology , 08860 Barcelona, Spain
| | - Johann Berthelot
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, Marseille, France
| | - Pamina M Winkler
- ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology , 08860 Barcelona, Spain
| | - Mathieu Mivelle
- Université Pierre et Marie Curie, CNRS, Institut des NanoSciences de Paris, UMR 7588, 75005 Paris, France
| | - Julien Proust
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, Marseille, France
| | | | - Igor Ozerov
- Aix Marseille Univ, CNRS, CINAM, Marseille, France
| | - Thomas Begou
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, Marseille, France
| | - Julien Lumeau
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, Marseille, France
| | - Hervé Rigneault
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, Marseille, France
| | - María F García-Parajó
- ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology , 08860 Barcelona, Spain
- ICREA, Pg. Lluís Companys 23, 08010 Barcelona, Spain
| | - Sébastien Bidault
- ESPCI Paris, PSL Research University, CNRS, INSERM, Institut Langevin, 75005 Paris, France
| | - Jérôme Wenger
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, Marseille, France
| | - Nicolas Bonod
- Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel, Marseille, France
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33
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Bidault S, Devilez A, Maillard V, Lermusiaux L, Guigner JM, Bonod N, Wenger J. Picosecond Lifetimes with High Quantum Yields from Single-Photon-Emitting Colloidal Nanostructures at Room Temperature. ACS Nano 2016; 10:4806-4815. [PMID: 26972678 DOI: 10.1021/acsnano.6b01729] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Minimizing the luminescence lifetime while maintaining a high emission quantum yield is paramount in optimizing the excitation cross-section, radiative decay rate, and brightness of quantum solid-state light sources, particularly at room temperature, where nonradiative processes can dominate. We demonstrate here that DNA-templated 60 and 80 nm diameter gold nanoparticle dimers, featuring one fluorescent molecule, provide single-photon emission with lifetimes that can fall below 10 ps and typical quantum yields in a 45-70% range. Since these colloidal nanostructures are obtained as a purified aqueous suspension, fluorescence spectroscopy can be performed on both fixed and freely diffusing nanostructures to quantitatively estimate the distributions of decay rate and fluorescence intensity enhancements. These data are in excellent agreement with theoretical calculations and demonstrate that millions of bright fluorescent nanostructures, with radiative lifetimes below 100 ps, can be produced in parallel.
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Affiliation(s)
- Sébastien Bidault
- ESPCI Paris, PSL Research University, CNRS, INSERM, Institut Langevin , 1 Rue Jussieu, F-75005 Paris, France
| | - Alexis Devilez
- CNRS, Aix-Marseille Université, Centrale Marseille, Institut Fresnel, UMR 7249 , 13013 Marseille, France
| | - Vincent Maillard
- ESPCI Paris, PSL Research University, CNRS, INSERM, Institut Langevin , 1 Rue Jussieu, F-75005 Paris, France
| | - Laurent Lermusiaux
- ESPCI Paris, PSL Research University, CNRS, INSERM, Institut Langevin , 1 Rue Jussieu, F-75005 Paris, France
| | - Jean-Michel Guigner
- Institut de Minéralogie, de Physique des Matériaux, et de Cosmochimie (IMPMC), Sorbonne Universités, UMR 7590, CNRS, MNHN, Univ Paris 06, IRD UMR 206 , Paris, France
| | - Nicolas Bonod
- CNRS, Aix-Marseille Université, Centrale Marseille, Institut Fresnel, UMR 7249 , 13013 Marseille, France
| | - Jérôme Wenger
- CNRS, Aix-Marseille Université, Centrale Marseille, Institut Fresnel, UMR 7249 , 13013 Marseille, France
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34
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de Torres J, Ferrand P, Colas des Francs G, Wenger J. Coupling Emitters and Silver Nanowires to Achieve Long-Range Plasmon-Mediated Fluorescence Energy Transfer. ACS Nano 2016; 10:3968-3976. [PMID: 27019008 DOI: 10.1021/acsnano.6b00287] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The development of quantum plasmonic circuitry requires efficient coupling between quantum emitters and plasmonic waveguides. A major experimental challenge is to simultaneously maximize the surface plasmon propagation length, the coupling efficiency into the plasmonic mode, and the Purcell factor. Addressing this challenge is also the key to enabling long-range energy transfer between quantum nanoemitters. Here, we use a dual-beam scanning confocal microscope to carefully investigate the interactions between fluorescent nanoparticles and surface plasmons on single-crystalline silver nanowires. By exciting the fluorescent nanoparticles via nanowire surface plasmons, we maximize the light-matter interactions and reach coupling efficiencies up to 44% together with 24× lifetime reduction and 4.1 μm propagation lengths. This improved optical performance enables the demonstration of long-range plasmon-mediated fluorescence energy transfer between two nanoparticles separated by micrometer distance. Our results provide guidelines toward practical realizations of efficient long-range fluorescence energy transfer for integrated plasmonics and quantum nano-optics.
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Affiliation(s)
- Juan de Torres
- CNRS, Aix-Marseille Université, Centrale Marseille, Institut Fresnel , UMR 7249, 13013 Marseille, France
| | - Patrick Ferrand
- CNRS, Aix-Marseille Université, Centrale Marseille, Institut Fresnel , UMR 7249, 13013 Marseille, France
| | - Gérard Colas des Francs
- Université Bourgogne Franche-Comté, CNRS, Laboratoire Interdisciplinaire Carnot de Bourgogne (ICB) , UMR 6303, 21078 Dijon, France
| | - Jérôme Wenger
- CNRS, Aix-Marseille Université, Centrale Marseille, Institut Fresnel , UMR 7249, 13013 Marseille, France
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35
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Schaarschmidt W, Hagmann H, Roth B, Cingoez T, Karumanchi A, Wenger J, Lucchesi KJ, Tamez H, Lindner T, Fridmann A, Thome U, Kribs A, Danner M, Hamacher S, Mallmann P, Stepan H, Benzing T, Thadhani R. Removal of soluble Fms-like tyrosine kinase (sFlt-1) by plasma-specific apheresis: pilot study in women with very preterm preeclampsia. Z Geburtshilfe Neonatol 2015. [DOI: 10.1055/s-0035-1566532] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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36
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Regmi R, Al Balushi AA, Rigneault H, Gordon R, Wenger J. Nanoscale volume confinement and fluorescence enhancement with double nanohole aperture. Sci Rep 2015; 5:15852. [PMID: 26511149 PMCID: PMC4625367 DOI: 10.1038/srep15852] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2015] [Accepted: 10/02/2015] [Indexed: 11/15/2022] Open
Abstract
Diffraction ultimately limits the fluorescence collected from a single molecule, and sets an upper limit to the maximum concentration to isolate a single molecule in the detection volume. To overcome these limitations, we introduce here the use of a double nanohole structure with 25 nm gap, and report enhanced detection of single fluorescent molecules in concentrated solutions exceeding 20 micromolar. The nanometer gap concentrates the light into an apex volume down to 70 zeptoliter (10(-21) L), 7000-fold below the diffraction-limited confocal volume. Using fluorescence correlation spectroscopy and time-correlated photon counting, we measure fluorescence enhancement up to 100-fold, together with local density of optical states (LDOS) enhancement of 30-fold. The distinctive features of double nanoholes combining high local field enhancement, efficient background screening and relative nanofabrication simplicity offer new strategies for real time investigation of biochemical events with single molecule resolution at high concentrations.
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Affiliation(s)
- Raju Regmi
- CNRS, Aix Marseille Université, Centrale Marseille, Institut Fresnel, 13013 Marseille, France
| | - Ahmed A. Al Balushi
- Department of Electrical Engineering, University of Victoria, Victoria, British Columbia V8W 3P6, Canada
| | - Hervé Rigneault
- CNRS, Aix Marseille Université, Centrale Marseille, Institut Fresnel, 13013 Marseille, France
| | - Reuven Gordon
- Department of Electrical Engineering, University of Victoria, Victoria, British Columbia V8W 3P6, Canada
| | - Jérôme Wenger
- CNRS, Aix Marseille Université, Centrale Marseille, Institut Fresnel, 13013 Marseille, France
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37
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Wenger J. Polio Eradication—The Journey So Far. Int J Epidemiol 2015. [DOI: 10.1093/ije/dyv097.183] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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38
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Bruce MG, Zulz T, Debyle C, Singleton R, Hurlburt D, Bruden D, Rudolph K, Hennessy T, Klejka J, Wenger J. Invasive Disease Caused by Haemophilus Influenzae Serotype a, an Emerging Pathogen in Alaska. Int J Epidemiol 2015. [DOI: 10.1093/ije/dyv096.308] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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39
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Ghenuche P, Mivelle M, de Torres J, Moparthi SB, Rigneault H, Van Hulst NF, García-Parajó MF, Wenger J. Matching Nanoantenna Field Confinement to FRET Distances Enhances Förster Energy Transfer Rates. Nano Lett 2015; 15:6193-6201. [PMID: 26237534 DOI: 10.1021/acs.nanolett.5b02535] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Förster resonance energy transfer (FRET) is widely applied in chemistry, biology, and nanosciences to assess distances on sub-10 nm scale. Extending the range and applicability of FRET requires enhancement of the fluorescence energy transfer at a spatial scale comparable to the donor-acceptor distances. Plasmonic nanoantennas are ideal to concentrate optical fields at a nanoscale fully matching the FRET distance range. Here, we present a resonant aluminum nanogap antenna tailored to enhance single molecule FRET. A 20 nm gap confines light into a nanoscale volume, providing a field gradient on the scale of the donor-acceptor distance, a large 10-fold increase in the local density of optical states, and strong intensity enhancement. With our dedicated design, we obtain 20-fold enhancement on the fluorescence emission of donor and acceptor dyes, and most importantly up to 5-fold enhancement of the FRET rate for donor-acceptor separations of 10 nm. We also provide a thorough framework of the fluorescence photophysics occurring in the nanoscale gap volume. The presented enhancement of energy transfer flow at the nanoscale opens a yet unexplored facet of the various advantages of optical nanoantennas and provides a new strategy toward biological applications of single molecule FRET at micromolar concentrations.
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Affiliation(s)
- Petru Ghenuche
- CNRS, Aix-Marseille Université, Centrale Marseille, Institut Fresnel, UMR 7249, 13013 Marseille, France
| | - Mathieu Mivelle
- ICFO-Institut de Ciencies Fotoniques, Mediterranean Technology Park, 08860 Castelldefels, Spain
| | - Juan de Torres
- CNRS, Aix-Marseille Université, Centrale Marseille, Institut Fresnel, UMR 7249, 13013 Marseille, France
| | - Satish Babu Moparthi
- CNRS, Aix-Marseille Université, Centrale Marseille, Institut Fresnel, UMR 7249, 13013 Marseille, France
| | - Hervé Rigneault
- CNRS, Aix-Marseille Université, Centrale Marseille, Institut Fresnel, UMR 7249, 13013 Marseille, France
| | - Niek F Van Hulst
- ICFO-Institut de Ciencies Fotoniques, Mediterranean Technology Park, 08860 Castelldefels, Spain
- ICREA-Institució Catalana de Recerca i Estudis Avançats, Barcelona 08010, Spain
| | - María F García-Parajó
- ICFO-Institut de Ciencies Fotoniques, Mediterranean Technology Park, 08860 Castelldefels, Spain
- ICREA-Institució Catalana de Recerca i Estudis Avançats, Barcelona 08010, Spain
| | - Jérôme Wenger
- CNRS, Aix-Marseille Université, Centrale Marseille, Institut Fresnel, UMR 7249, 13013 Marseille, France
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Bon P, Bourg N, Lécart S, Monneret S, Fort E, Wenger J, Lévêque-Fort S. Three-dimensional nanometre localization of nanoparticles to enhance super-resolution microscopy. Nat Commun 2015. [PMID: 26212705 PMCID: PMC4525210 DOI: 10.1038/ncomms8764] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Meeting the nanometre resolution promised by super-resolution microscopy techniques (pointillist: PALM, STORM, scanning: STED) requires stabilizing the sample drifts in real time during the whole acquisition process. Metal nanoparticles are excellent probes to track the lateral drifts as they provide crisp and photostable information. However, achieving nanometre axial super-localization is still a major challenge, as diffraction imposes large depths-of-fields. Here we demonstrate fast full three-dimensional nanometre super-localization of gold nanoparticles through simultaneous intensity and phase imaging with a wavefront-sensing camera based on quadriwave lateral shearing interferometry. We show how to combine the intensity and phase information to provide the key to the third axial dimension. Presently, we demonstrate even in the occurrence of large three-dimensional fluctuations of several microns, unprecedented sub-nanometre localization accuracies down to 0.7 nm in lateral and 2.7 nm in axial directions at 50 frames per second. We demonstrate that nanoscale stabilization greatly enhances the image quality and resolution in direct stochastic optical reconstruction microscopy imaging.
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Affiliation(s)
- Pierre Bon
- Laboratoire Photonique Numérique et Nanosciences (LP2N), CNRS UMR5298, Institut d'Optique Graduate School, Bordeaux University, Rue Francois Mitterand, 33400 Talence, France.,Institut Langevin, ESPCI ParisTech, CNRS UMR 7587, PSL Research University, 1 rue Jussieu, Paris 75238, France.,Institut des Sciences Moléculaires d'Orsay (ISMO), University Paris-Sud, CNRS UMR 8214, Orsay 91405, France
| | - Nicolas Bourg
- Institut des Sciences Moléculaires d'Orsay (ISMO), University Paris-Sud, CNRS UMR 8214, Orsay 91405, France
| | - Sandrine Lécart
- Centre de photonique Biomédicale (CPBM/CLUPS/LUMAT) FR2764, University Paris-Sud, Orsay 91405, France
| | - Serge Monneret
- CNRS, Aix Marseille Université, Ecole Centrale Marseille, Institut Fresnel UMR7249, 13013 Marseille, France
| | - Emmanuel Fort
- Institut Langevin, ESPCI ParisTech, CNRS UMR 7587, PSL Research University, 1 rue Jussieu, Paris 75238, France
| | - Jérôme Wenger
- CNRS, Aix Marseille Université, Ecole Centrale Marseille, Institut Fresnel UMR7249, 13013 Marseille, France
| | - Sandrine Lévêque-Fort
- Institut des Sciences Moléculaires d'Orsay (ISMO), University Paris-Sud, CNRS UMR 8214, Orsay 91405, France
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Schaarschmidt W, Thadhani R, Hagmann H, Roth B, Kisner T, Karumanchi SA, Wenger J, Lucchesi KJ, Hector T, Lindner T, Fridman A, Thome U, Kribs A, Danner M, Mallmann P, Stepan H, Benzing T. Removal of Soluble Fms-like Tyrosine Kinase (sFlt-1) by Plasma-Specific Apheresis: A Pilot Study in Women with Severe Preterm Preeclampsia. Geburtshilfe Frauenheilkd 2015. [DOI: 10.1055/s-0035-1548707] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
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42
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Moparthi SB, Thieulin-Pardo G, de Torres J, Ghenuche P, Gontero B, Wenger J. FRET analysis of CP12 structural interplay by GAPDH and PRK. Biochem Biophys Res Commun 2015; 458:488-493. [PMID: 25666947 DOI: 10.1016/j.bbrc.2015.01.135] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2015] [Accepted: 01/27/2015] [Indexed: 10/24/2022]
Abstract
CP12 is an intrinsically disordered protein playing a key role in the regulation of the Benson-Calvin cycle. Due to the high intrinsic flexibility of CP12, it is essential to consider its structural modulation induced upon binding to the glyceraldehyde-3-phosphate dehydrogenase (GAPDH) and phosphoribulokinase (PRK) enzymes. Here, we report for the first time detailed structural modulation about the wild-type CP12 and its site-specific N-terminal and C-terminal disulfide bridge mutants upon interaction with GAPDH and PRK by Förster resonance energy transfer (FRET). Our results indicate an increase in CP12 compactness when the complex is formed with GAPDH or PRK. In addition, the distributions in FRET histograms show the elasticity and conformational flexibility of CP12 in all supra molecular complexes. Contrarily to previous beliefs, our FRET results importantly reveal that both N-terminal and C-terminal site-specific CP12 mutants are able to form the monomeric (GAPDH-CP12-PRK) complex.
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Affiliation(s)
- Satish Babu Moparthi
- Aix Marseille Université, CNRS, Centrale Marseille, Institut Fresnel, UMR 7249, 13013 Marseille, France.
| | - Gabriel Thieulin-Pardo
- Aix Marseille Université, CNRS, UMR 7281 Laboratoire de Bioénergétique et Ingénierie des Protéines, 13402 Marseille Cedex 20, France
| | - Juan de Torres
- Aix Marseille Université, CNRS, Centrale Marseille, Institut Fresnel, UMR 7249, 13013 Marseille, France
| | - Petru Ghenuche
- Aix Marseille Université, CNRS, Centrale Marseille, Institut Fresnel, UMR 7249, 13013 Marseille, France
| | - Brigitte Gontero
- Aix Marseille Université, CNRS, UMR 7281 Laboratoire de Bioénergétique et Ingénierie des Protéines, 13402 Marseille Cedex 20, France
| | - Jérôme Wenger
- Aix Marseille Université, CNRS, Centrale Marseille, Institut Fresnel, UMR 7249, 13013 Marseille, France
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de Torres J, Ghenuche P, Moparthi SB, Grigoriev V, Wenger J. FRET enhancement in aluminum zero-mode waveguides. Chemphyschem 2015; 16:782-8. [PMID: 25640052 DOI: 10.1002/cphc.201402651] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2014] [Revised: 11/14/2014] [Indexed: 11/08/2022]
Abstract
Zero-mode waveguides (ZMWs) can confine light into attoliter volumes, which enables single molecule fluorescence experiments at physiological micromolar concentrations. Of the fluorescence spectroscopy techniques that can be enhanced by ZMWs, Förster resonance energy transfer (FRET) is one of the most widely used in life sciences. Combining zero-mode waveguides with FRET provides new opportunities to investigate biochemical structures or follow interaction dynamics at micromolar concentrations with single-molecule resolution. However, prior to any quantitative FRET analysis on biological samples, it is crucial to establish first the influence of the ZMW on the FRET process. Here, we quantify the FRET rates and efficiencies between individual donor-acceptor fluorophore pairs that diffuse into aluminum zero-mode waveguides. Aluminum ZMWs are important structures thanks to their commercial availability and the large amount of literature that describe their use for single-molecule fluorescence spectroscopy. We also compared the results between ZMWs milled in gold and aluminum, and found that although gold has a stronger influence on the decay rates, the lower losses of aluminum in the green spectral region provide larger fluorescence brightness enhancement factors. For both aluminum and gold ZMWs, we observed that the FRET rate scales linearly with the isolated donor decay rate and the local density of optical states. Detailed information about FRET in ZMWs unlocks their application as new devices for enhanced single-molecule FRET at physiological concentrations.
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Affiliation(s)
- Juan de Torres
- CNRS, Aix-Marseille Université, Centrale Marseille, Institut Fresnel, UMR 7249, 13013 Marseille (France)
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Ghenuche P, de Torres J, Moparthi SB, Grigoriev V, Wenger J. Nanophotonic enhancement of the Förster resonance energy-transfer rate with single nanoapertures. Nano Lett 2014; 14:4707-4714. [PMID: 25020141 DOI: 10.1021/nl5018145] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Tailoring the light-matter interaction and the local density of optical states (LDOS) with nanophotonics provides accurate control over the luminescence properties of a single quantum emitter. This paradigm is also highly attractive to enhance the near-field Förster resonance energy transfer (FRET) between two fluorescent emitters. Despite the wide applications of FRET in nanosciences, using nanophotonics to enhance FRET has remained a debated and complex challenge. Here we demonstrate enhanced energy transfer within single donor-acceptor fluorophore pairs confined in single gold nanoapertures. Experiments monitoring both the donor and the acceptor emission photodynamics clearly establish a linear dependence of the FRET rate on the LDOS in nanoapertures, demonstrating that nanophotonics can be used to intensify the near-field energy transfer. Strikingly, we observe a significant six-fold increase in the FRET rate for large donor-acceptor separations exceeding 13 nm. Exciting opportunities are opened to investigate biochemical structures with donor-acceptor distances much beyond the classical Förster radius. Importantly, our approach is fully compatible with the detection of single biomolecules freely diffusing in water solution under physiological conditions.
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Affiliation(s)
- Petru Ghenuche
- CNRS, Aix-Marseille Université, Centrale Marseille, Institut Fresnel, UMR 7249, 13013 Marseille, France
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Moparthi SB, Thieulin-Pardo G, Mansuelle P, Rigneault H, Gontero B, Wenger J. Conformational modulation and hydrodynamic radii of CP12 protein and its complexes probed by fluorescence correlation spectroscopy. FEBS J 2014; 281:3206-17. [DOI: 10.1111/febs.12854] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2014] [Revised: 04/30/2014] [Accepted: 05/16/2014] [Indexed: 11/28/2022]
Affiliation(s)
| | - Gabriel Thieulin-Pardo
- Laboratoire de Bioénergétique et Ingénierie des Protéines; Aix Marseille Université; France
| | - Pascal Mansuelle
- Plate-forme Protéomique; Marseille Protéomique; Institut de Microbiologie de la Méditerranée; France
| | - Hervé Rigneault
- Centrale Marseille; Institut Fresnel; Aix Marseille Université; France
| | - Brigitte Gontero
- Laboratoire de Bioénergétique et Ingénierie des Protéines; Aix Marseille Université; France
| | - Jérôme Wenger
- Centrale Marseille; Institut Fresnel; Aix Marseille Université; France
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Punj D, Ghenuche P, Moparthi SB, de Torres J, Grigoriev V, Rigneault H, Wenger J. Plasmonic antennas and zero-mode waveguides to enhance single molecule fluorescence detection and fluorescence correlation spectroscopy toward physiological concentrations. WIREs Nanomed Nanobiotechnol 2014; 6:268-82. [DOI: 10.1002/wnan.1261] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Deep Punj
- CNRS, Aix Marseille Université, Centrale Marseille, Institut Fresnel; UMR 7249; 13013 Marseille France
| | - Petru Ghenuche
- CNRS, Aix Marseille Université, Centrale Marseille, Institut Fresnel; UMR 7249; 13013 Marseille France
| | - Satish Babu Moparthi
- CNRS, Aix Marseille Université, Centrale Marseille, Institut Fresnel; UMR 7249; 13013 Marseille France
| | - Juan de Torres
- CNRS, Aix Marseille Université, Centrale Marseille, Institut Fresnel; UMR 7249; 13013 Marseille France
| | - Victor Grigoriev
- CNRS, Aix Marseille Université, Centrale Marseille, Institut Fresnel; UMR 7249; 13013 Marseille France
| | - Hervé Rigneault
- CNRS, Aix Marseille Université, Centrale Marseille, Institut Fresnel; UMR 7249; 13013 Marseille France
| | - Jérôme Wenger
- CNRS, Aix Marseille Université, Centrale Marseille, Institut Fresnel; UMR 7249; 13013 Marseille France
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Punj D, de Torres J, Rigneault H, Wenger J. Gold nanoparticles for enhanced single molecule fluorescence analysis at micromolar concentration. Opt Express 2013; 21:27338-27343. [PMID: 24216956 DOI: 10.1364/oe.21.027338] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Individual metal nanoparticles represent an inexpensive and versatile platform to enhance the detection of fluorescent species at biologically relevant concentrations. Here we use fluorescence correlation spectroscopy to quantify the near-field detection volume and average fluorescence enhancement factors set by a single gold nanoparticle. We demonstrate detection volumes down to 270 zeptoliters (three orders of magnitude beyond the diffraction barrier) together with 60-fold enhancement of the fluorescence brightness per molecule.
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48
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Abstract
Plasmonics and photonic crystals are two complementary approaches to tailor single-emitter fluorescence, using strong local field enhancements near metals on one hand and spatially extended photonic band structure effects on the other hand. Here, we explore the emergence of spontaneous emission control by finite-sized hexagonal arrays of nanoapertures milled in gold film. We demonstrate that already small lattices enable highly directional and enhanced emission from single fluorescent molecules in the central aperture. Even for clusters just four unit cells across, the directionality is set by the plasmonic crystal band structure, as confirmed by full-wave numerical simulations. This realization of plasmonic phase array antennas driven by single quantum emitters opens a flexible toolbox to engineer fluorescence and its detection.
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Affiliation(s)
- Lutz Langguth
- Center for Nanophotonics, FOM Institute for Atomic and Molecular Physics (AMOLF) , Science Park 104, 1098 XG Amsterdam, The Netherlands
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Punj D, Mivelle M, Moparthi SB, van Zanten TS, Rigneault H, van Hulst NF, García-Parajó MF, Wenger J. A plasmonic 'antenna-in-box' platform for enhanced single-molecule analysis at micromolar concentrations. Nat Nanotechnol 2013; 8:512-6. [PMID: 23748196 DOI: 10.1038/nnano.2013.98] [Citation(s) in RCA: 109] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2012] [Accepted: 04/26/2013] [Indexed: 05/22/2023]
Abstract
Single-molecule fluorescence techniques are key for a number of applications, including DNA sequencing, molecular and cell biology and early diagnosis. Unfortunately, observation of single molecules by diffraction-limited optics is restricted to detection volumes in the femtolitre range and requires pico- or nanomolar concentrations, far below the micromolar range where most biological reactions occur. This limitation can be overcome using plasmonic nanostructures, which enable the confinement of light down to nanoscale volumes. Although these nanoantennas enhance fluorescence brightness, large background signals and/or unspecific binding to the metallic surface have hampered the detection of individual fluorescent molecules in solution at high concentrations. Here we introduce a novel 'antenna-in-box' platform that is based on a gap-antenna inside a nanoaperture. This design combines fluorescent signal enhancement and background screening, offering high single-molecule sensitivity (fluorescence enhancement up to 1,100-fold and microsecond transit times) at micromolar sample concentrations and zeptolitre-range detection volumes. The antenna-in-box device can be optimized for single-molecule fluorescence studies at physiologically relevant concentrations, as we demonstrate using various biomolecules.
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Affiliation(s)
- Deep Punj
- CNRS, Aix-Marseille Université, Ecole Centrale Marseille, Institut Fresnel, Campus de St Jérôme, 13397 Marseille, France
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Schnettler WT, Dukhovny D, Wenger J, Salahuddin S, Ralston SJ, Rana S. Cost and resource implications with serum angiogenic factor estimation in the triage of pre-eclampsia. BJOG 2013; 120:1224-32. [PMID: 23647884 DOI: 10.1111/1471-0528.12259] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/07/2013] [Indexed: 01/07/2023]
Abstract
OBJECTIVES To analyse the economic and resource implications of using plasma soluble fms-like tyrosine kinase-1 s(Flt1) and placenta growth factor (PlGF) measurements in pre-eclampsia evaluation and management. DESIGN Retrospective cost analysis of our prospective cohort study. SETTING Boston, Massachusetts (USA). POPULATION Women (n = 176) presenting to the hospital at <34 weeks of gestation for evaluation of possible pre-eclampsia during 2009-10. Cases without complete cost or outcome data (n = 9) and re-enrolments (n = 18) were excluded. METHODS Modelled comparisons between the standard approach (combination of blood pressure, urinary protein excretion, alanine aminotransferase and platelet counts) and a novel approach (ratio of plasma sFlt1 and PlGF) using actual hospital data converted to 2012 US dollars in accordance with the Centers for Medicare and Medicaid Services. MAIN OUTCOME MEASURES Direct 2-week costs and resource use by groups having true or false positive and negative test results for adverse outcomes according to approach. RESULTS The improved specificity of the novel approach decreased the proportion of women falsely labelled as test-positive from 42.3% (34.4-50.2%) to 4.0% (0.85-7.15%) and increased the proportion correctly labelled as test-negative from 23.5% (16.7-30.3%) to 61.7% (53.9-69.5%). This could potentially reduce average per-patient costs by $1215. Substantial quantities of resources [47.2% (35.7-58.7%) of antenatal admissions and 72.5% (68.0-77.0%) of tests for fetal wellbeing] were unnecessarily used for women who were truly negative. A proportion of iatrogenic preterm deliveries among women with negative results was potentially avoidable representing further cost and resource savings. CONCLUSIONS Clinical use of the plasma sFlt1 and PlGF ratio improves risk stratification among women presenting for pre-eclampsia evaluation and has the potential to reduce costs and resource use.
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Affiliation(s)
- W T Schnettler
- Division of Maternal-Fetal Medicine, Beth Israel Deaconess Medical Center, Boston, MA, USA
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