1
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Malý P, Strachotová D, Holoubek A, Heřman P. Interferometric excitation fluorescence lifetime imaging microscopy. Nat Commun 2024; 15:8019. [PMID: 39271727 PMCID: PMC11399241 DOI: 10.1038/s41467-024-52333-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2023] [Accepted: 09/04/2024] [Indexed: 09/15/2024] Open
Abstract
Fluorescence lifetime imaging microscopy (FLIM) is a well-established technique with numerous imaging applications. Yet, one of the limitations of FLIM is that it only provides information about the emitting state. Here, we present an extension of FLIM by interferometric measurement of fluorescence excitation spectra. Interferometric Excitation Fluorescence Lifetime Imaging Microscopy (ixFLIM) reports on the correlation of the excitation spectra and emission lifetime, providing the correlation between the ground-state absorption and excited-state emission. As such, it extends the applicability of FLIM and removes some of its limitations. We introduce ixFLIM on progressively more complex systems, directly compare it to standard FLIM, and apply it to quantitative resonance energy transfer imaging from a single measurement.
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Affiliation(s)
- Pavel Malý
- Faculty of Mathematics and Physics, Institute of Physics, Charles University, Prague, Czech Republic.
| | - Dita Strachotová
- Faculty of Mathematics and Physics, Institute of Physics, Charles University, Prague, Czech Republic
| | - Aleš Holoubek
- Department of Proteomics, Institute of Hematology and Blood Transfusion, Prague, Czech Republic
| | - Petr Heřman
- Faculty of Mathematics and Physics, Institute of Physics, Charles University, Prague, Czech Republic
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2
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Yoneda Y, Kuramochi H. Room-Temperature Solution Fluorescence Excitation Correlation Spectroscopy. J Phys Chem Lett 2024; 15:8533-8539. [PMID: 39135215 DOI: 10.1021/acs.jpclett.4c01798] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/23/2024]
Abstract
Single-molecule fluorescence spectroscopy is a powerful tool for investigating the physical properties of individual molecules, yet elucidating the fast fluctuation dynamics of freely diffusing single molecules in solution at room temperature, where a variety of chemical and biological processes occur, remains challenging. In this study, we report on fluorescence excitation correlation spectroscopy of room-temperature solutions, which enables the study of spontaneous fluctuation of the excitation spectrum with microsecond time resolution. By employing Fourier transform spectroscopy with broadband femtosecond pulses and time-correlated single-photon counting, we achieved fluorescence excitation spectroscopy of a room-temperature solution at the single-molecule level. Building upon this single-molecule measurement, we obtained an excitation wavelength-resolved fluorescence autocorrelation function in the microsecond to millisecond range, demonstrating the potential of this method to elucidate fast, spontaneous, time-dependent changes of excitation spectra in statistically equilibrated systems. With further development, this method will allow the study of spectral exchange associated with transitions between sub-ensembles of solution-phase molecules with unprecedented time resolution.
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Affiliation(s)
- Yusuke Yoneda
- Research Center of Integrative Molecular Systems (CIMoS), Institute for Molecular Science, National Institutes of Natural Sciences, 38 Nishigo-Naka, Myodaiji, Okazaki 444-8585, Japan
- Graduate Institute for Advanced Studies, SOKENDAI, 38 Nishigo-Naka, Myodaiji, Okazaki 444-8585, Japan
| | - Hikaru Kuramochi
- Research Center of Integrative Molecular Systems (CIMoS), Institute for Molecular Science, National Institutes of Natural Sciences, 38 Nishigo-Naka, Myodaiji, Okazaki 444-8585, Japan
- Graduate Institute for Advanced Studies, SOKENDAI, 38 Nishigo-Naka, Myodaiji, Okazaki 444-8585, Japan
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3
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Keitel R, Brechbühler R, Cocina A, Antolinez FV, Meyer SA, Vonk SJW, Rojo H, Rabouw FT, Norris DJ. Fluctuations in the Photoluminescence Excitation Spectra of Individual Semiconductor Nanocrystals. J Phys Chem Lett 2024; 15:4844-4850. [PMID: 38682807 PMCID: PMC11089566 DOI: 10.1021/acs.jpclett.4c00516] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2024] [Revised: 04/07/2024] [Accepted: 04/09/2024] [Indexed: 05/01/2024]
Abstract
Most single quantum emitters display non-steady emission properties. Models that explain this effect have primarily relied on photoluminescence measurements that reveal variations in intensity, wavelength, and excited-state lifetime. While photoluminescence excitation spectroscopy could provide complementary information, existing experimental methods cannot collect spectra before individual emitters change in intensity (blink) or wavelength (spectrally diffuse). Here, we present an experimental approach that circumvents such issues, allowing the collection of excitation spectra from individual emitters. Using rapid modulation of the excitation wavelength, we collect and classify excitation spectra from individual CdSe/CdS/ZnS core/shell/shell quantum dots. The spectra, along with simultaneous time-correlated single-photon counting, reveal two separate emission-reduction mechanisms caused by charging and trapping, respectively. During bright emission periods, we also observe a correlation between emission red-shifts and the increased oscillator strength of higher excited states. Quantum-mechanical modeling indicates that diffusion of charges in the vicinity of an emitter polarizes the exciton and transfers the oscillator strength to higher-energy transitions.
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Affiliation(s)
- Robert
C. Keitel
- Optical
Materials Engineering Laboratory, Department of Mechanical and Process
Engineering, ETH Zurich, 8092 Zurich, Switzerland
| | - Raphael Brechbühler
- Optical
Materials Engineering Laboratory, Department of Mechanical and Process
Engineering, ETH Zurich, 8092 Zurich, Switzerland
| | - Ario Cocina
- Optical
Materials Engineering Laboratory, Department of Mechanical and Process
Engineering, ETH Zurich, 8092 Zurich, Switzerland
| | - Felipe V. Antolinez
- Optical
Materials Engineering Laboratory, Department of Mechanical and Process
Engineering, ETH Zurich, 8092 Zurich, Switzerland
| | - Stefan A. Meyer
- Optical
Materials Engineering Laboratory, Department of Mechanical and Process
Engineering, ETH Zurich, 8092 Zurich, Switzerland
| | - Sander J. W. Vonk
- Optical
Materials Engineering Laboratory, Department of Mechanical and Process
Engineering, ETH Zurich, 8092 Zurich, Switzerland
- Debye
Institute for Nanomaterials Science, Utrecht
University, 3584 CC Utrecht, The Netherlands
| | - Henar Rojo
- Optical
Materials Engineering Laboratory, Department of Mechanical and Process
Engineering, ETH Zurich, 8092 Zurich, Switzerland
| | - Freddy T. Rabouw
- Optical
Materials Engineering Laboratory, Department of Mechanical and Process
Engineering, ETH Zurich, 8092 Zurich, Switzerland
- Debye
Institute for Nanomaterials Science, Utrecht
University, 3584 CC Utrecht, The Netherlands
| | - David J. Norris
- Optical
Materials Engineering Laboratory, Department of Mechanical and Process
Engineering, ETH Zurich, 8092 Zurich, Switzerland
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4
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Zhang X, Taniguchi R, Nagao R, Tomo T, Noguchi T, Ye S, Shibata Y. Access to the Antenna System of Photosystem I via Single-Molecule Excitation-Emission Spectroscopy. J Phys Chem B 2024; 128:2664-2674. [PMID: 38456814 DOI: 10.1021/acs.jpcb.3c07789] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/09/2024]
Abstract
In the development of single-molecule spectroscopy, the simultaneous detection of the excitation and emission spectra has been limited. The fluorescence excitation spectrum based on background-free signals is compatible with the fluorescence-emission-based detection of single molecules and can provide insight into the variations in the input energy of the different terminal emitters. Here, we implement single-molecule excitation-emission spectroscopy (SMEES) for photosystem I (PSI) via a cryogenic optical microscope. To this end, we extended our line-focus-based excitation-spectral microscope system to the cryogenic temperature-compatible version. PSI is one of the two photosystems embedded in the thylakoid membrane in oxygen-free photosynthetic organisms. PSI plays an essential role in electron transfer in the photosynthesis reaction. PSIs of many organisms contain a few red-shifted chlorophylls (Chls) with much lower excitation energies than ordinary antenna Chls. The fluorescence emission spectrum originates primarily from the red-shifted Chls, whereas the excitation spectrum is sensitive to the antenna Chls that are upstream of red-shifted Chls. Using SMEES, we obtained the inclining two-dimensional excitation-emission matrix (2D-EEM) of PSI particles isolated from a cyanobacterium, Thermosynechococcus vestitus (equivalent to elongatus), at about 80 K. Interestingly, by decomposing the inclining 2D-EEMs within time course observation, we found prominent variations in the excitation spectra of the red-shifted Chl pools with different emission wavelengths, strongly indicating the variable excitation energy transfer (EET) pathway from the antenna to the terminal emitting pools. SMEES helps us to directly gain information about the antenna system, which is fundamental to depicting the EET within pigment-protein complexes.
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Affiliation(s)
- Xianjun Zhang
- Department of Chemistry, Graduate School of Sciences, Tohoku University, Sendai 980-8578, Japan
- Division for Interdisciplinary Advanced Research and Education, Tohoku University, Sendai 980-8578, Japan
| | - Rin Taniguchi
- Department of Chemistry, Graduate School of Sciences, Tohoku University, Sendai 980-8578, Japan
| | - Ryo Nagao
- Faculty of Agriculture, Shizuoka University, Shizuoka 422-8529, Japan
| | - Tatsuya Tomo
- Department of Physics, Graduate School of Sciences, Tokyo University of Science, Tokyo 162-8601, Japan
| | - Takumi Noguchi
- Graduate School of Science, Nagoya University, Nagoya 464-8602, Japan
| | - Shen Ye
- Department of Chemistry, Graduate School of Sciences, Tohoku University, Sendai 980-8578, Japan
| | - Yutaka Shibata
- Department of Chemistry, Graduate School of Sciences, Tohoku University, Sendai 980-8578, Japan
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5
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Liisberg MB, Rück V, Vosch T. Time gated Fourier transform spectroscopy with burst excitation for time-resolved spectral maps from the nano- to millisecond range. Chem Commun (Camb) 2023; 59:12625-12628. [PMID: 37791644 DOI: 10.1039/d3cc03961g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/05/2023]
Abstract
We demonstrate burst-mode Time Gated Fourier Transform Spectroscopy (bmTG-FTS), a technique for simultaneously capturing and disentangling emission signals from short- (ns) and long-lived (μs-ms) states. We showcase the possibilities of the technique by preparing time gated temporal-spectral maps from a dual-emissive DNA-stabilized silver nanocluster (DNA-AgNC).
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Affiliation(s)
- Mikkel B Liisberg
- Nanoscience Center and Department of Chemistry, University of Copenhagen, Universitetsparken 5, Copenhagen 2100, Denmark.
| | - Vanessa Rück
- Nanoscience Center and Department of Chemistry, University of Copenhagen, Universitetsparken 5, Copenhagen 2100, Denmark.
| | - Tom Vosch
- Nanoscience Center and Department of Chemistry, University of Copenhagen, Universitetsparken 5, Copenhagen 2100, Denmark.
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6
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Gelin MF, Chen L, Domcke W. Equation-of-Motion Methods for the Calculation of Femtosecond Time-Resolved 4-Wave-Mixing and N-Wave-Mixing Signals. Chem Rev 2022; 122:17339-17396. [PMID: 36278801 DOI: 10.1021/acs.chemrev.2c00329] [Citation(s) in RCA: 20] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Femtosecond nonlinear spectroscopy is the main tool for the time-resolved detection of photophysical and photochemical processes. Since most systems of chemical interest are rather complex, theoretical support is indispensable for the extraction of the intrinsic system dynamics from the detected spectroscopic responses. There exist two alternative theoretical formalisms for the calculation of spectroscopic signals, the nonlinear response-function (NRF) approach and the spectroscopic equation-of-motion (EOM) approach. In the NRF formalism, the system-field interaction is assumed to be sufficiently weak and is treated in lowest-order perturbation theory for each laser pulse interacting with the sample. The conceptual alternative to the NRF method is the extraction of the spectroscopic signals from the solutions of quantum mechanical, semiclassical, or quasiclassical EOMs which govern the time evolution of the material system interacting with the radiation field of the laser pulses. The NRF formalism and its applications to a broad range of material systems and spectroscopic signals have been comprehensively reviewed in the literature. This article provides a detailed review of the suite of EOM methods, including applications to 4-wave-mixing and N-wave-mixing signals detected with weak or strong fields. Under certain circumstances, the spectroscopic EOM methods may be more efficient than the NRF method for the computation of various nonlinear spectroscopic signals.
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Affiliation(s)
- Maxim F Gelin
- School of Science, Hangzhou Dianzi University, Hangzhou 310018, China
| | - Lipeng Chen
- Max-Planck-Institut für Physik komplexer Systeme, Nöthnitzer Strasse 38, D-01187 Dresden, Germany
| | - Wolfgang Domcke
- Department of Chemistry, Technical University of Munich, D-85747 Garching,Germany
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7
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van Heerden B, Vickers NA, Krüger TPJ, Andersson SB. Real-Time Feedback-Driven Single-Particle Tracking: A Survey and Perspective. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2022; 18:e2107024. [PMID: 35758534 PMCID: PMC9308725 DOI: 10.1002/smll.202107024] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2021] [Revised: 04/07/2022] [Indexed: 05/14/2023]
Abstract
Real-time feedback-driven single-particle tracking (RT-FD-SPT) is a class of techniques in the field of single-particle tracking that uses feedback control to keep a particle of interest in a detection volume. These methods provide high spatiotemporal resolution on particle dynamics and allow for concurrent spectroscopic measurements. This review article begins with a survey of existing techniques and of applications where RT-FD-SPT has played an important role. Each of the core components of RT-FD-SPT are systematically discussed in order to develop an understanding of the trade-offs that must be made in algorithm design and to create a clear picture of the important differences, advantages, and drawbacks of existing approaches. These components are feedback tracking and control, ranging from simple proportional-integral-derivative control to advanced nonlinear techniques, estimation to determine particle location from the measured data, including both online and offline algorithms, and techniques for calibrating and characterizing different RT-FD-SPT methods. Then a collection of metrics for RT-FD-SPT is introduced to help guide experimentalists in selecting a method for their particular application and to help reveal where there are gaps in the techniques that represent opportunities for further development. Finally, this review is concluded with a discussion on future perspectives in the field.
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Affiliation(s)
- Bertus van Heerden
- Department of Physics, University of Pretoria, Pretoria, 0002, South Africa
- Forestry and Agricultural Biotechnology Institute (FABI), University of Pretoria, Pretoria, 0002, South Africa
| | - Nicholas A Vickers
- Department of Mechanical Engineering, Boston University, Boston, MA, 02215, USA
| | - Tjaart P J Krüger
- Department of Physics, University of Pretoria, Pretoria, 0002, South Africa
- Forestry and Agricultural Biotechnology Institute (FABI), University of Pretoria, Pretoria, 0002, South Africa
| | - Sean B Andersson
- Department of Mechanical Engineering, Boston University, Boston, MA, 02215, USA
- Division of Systems Engineering, Boston University, Boston, MA, 02215, USA
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8
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Mewes L, Ingle RA, Al Haddad A, Chergui M. Broadband visible two-dimensional spectroscopy of molecular dyes. J Chem Phys 2021; 155:034201. [PMID: 34293898 DOI: 10.1063/5.0053554] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Two-dimensional Fourier transform spectroscopy is a promising technique to study ultrafast molecular dynamics. Similar to transient absorption spectroscopy, a more complete picture of the dynamics requires broadband laser pulses to observe transient changes over a large enough bandwidth, exceeding the inhomogeneous width of electronic transitions, as well as the separation between the electronic or vibronic transitions of interest. Here, we present visible broadband 2D spectra of a series of dye molecules and report vibrational coherences with frequencies up to ∼1400 cm-1 that were obtained after improvements to our existing two-dimensional Fourier transform setup [Al Haddad et al., Opt. Lett. 40, 312-315 (2015)]. The experiment uses white light from a hollow core fiber, allowing us to acquire 2D spectra with a bandwidth of 200 nm, in a range between 500 and 800 nm, and with a temporal resolution of 10-15 fs. 2D spectra of nile blue, rhodamine 800, terylene diimide, and pinacyanol iodide show vibronic spectral features with at least one vibrational mode and reveal information about structural motion via coherent oscillations of the 2D signals during the population time. For the case of pinacyanol iodide, these observations are complemented by its Raman spectrum, as well as the calculated Raman activity at the ground- and excited-state geometry.
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Affiliation(s)
- Lars Mewes
- Laboratoire de Spectroscopie Ultrarapide and LACUS, Ecole Polytechnique Fédérale de Lausanne, ISIC, FSB-BSP, CH-1015 Lausanne, Switzerland
| | - Rebecca A Ingle
- Laboratoire de Spectroscopie Ultrarapide and LACUS, Ecole Polytechnique Fédérale de Lausanne, ISIC, FSB-BSP, CH-1015 Lausanne, Switzerland
| | - Andre Al Haddad
- Laboratoire de Spectroscopie Ultrarapide and LACUS, Ecole Polytechnique Fédérale de Lausanne, ISIC, FSB-BSP, CH-1015 Lausanne, Switzerland
| | - Majed Chergui
- Laboratoire de Spectroscopie Ultrarapide and LACUS, Ecole Polytechnique Fédérale de Lausanne, ISIC, FSB-BSP, CH-1015 Lausanne, Switzerland
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9
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Lünemann DC, Thomas AR, Xu J, Bartölke R, Mouritsen H, De Sio A, Lienau C. Distinguishing between coherent and incoherent signals in excitation-emission spectroscopy. OPTICS EXPRESS 2021; 29:24326-24337. [PMID: 34614680 DOI: 10.1364/oe.428850] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2021] [Accepted: 06/15/2021] [Indexed: 06/13/2023]
Abstract
The separation of incoherent emission signals from coherent light scattering often poses a challenge in (time-resolved) microscopy or excitation-emission spectroscopy. While in spectro-microscopy with narrowband excitation this is commonly overcome using spectral filtering, it is less straightforward when using broadband Fourier-transform techniques that are now becoming commonplace in, e.g., single molecule or ultrafast nonlinear spectroscopy. Here we show that such a separation is readily achieved using highly stable common-path interferometers for both excitation and detection. The approach is demonstrated for suppression of scattering from flavin adenine dinucleotide (FAD) and weakly emissive cryptochrome 4 (Cry4) protein samples. We expect that the approach will be beneficial, e.g., for fluorescence lifetime or Raman-based imaging and spectroscopy of various samples, including single quantum emitters.
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10
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Zhang Y, Zhang Y, Song KH, Lin W, Sun C, Schatz GC, Zhang HF. Investigating Single-Molecule Fluorescence Spectral Heterogeneity of Rhodamines Using High-Throughput Single-Molecule Spectroscopy. J Phys Chem Lett 2021; 12:3914-3921. [PMID: 33861598 PMCID: PMC8607629 DOI: 10.1021/acs.jpclett.1c00192] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
We experimentally investigated several intramolecular coordinate and environmental changes as potential causes of single-molecule fluorescence spectral heterogeneities (smFSH). We developed a high-throughput single-molecule spectroscopy method to analyze more than 5000 single-molecule emission spectra from each of 9 commonly used fluorophores with different structural rigidities and deposited on substrates with different polarities. We observed an unexpectedly high smFSH from structurally rigid Rhodamine B compared with a structurally flexible Cyanine dye-Alexa Fluor 647. Based on experimentally measured smFSH, we ruled out the system's noise uncertainty, single-molecule spectral diffusion, and environmental polarity as the primary causes of the high smFSH. We found that the rotational flexibility of N,N-dialkylated groups contributed to the smFSH. With the high smFSH observed in structurally more rigid model fluorophores, we speculated that other intramolecular coordinate and environmental changes might also contribute to the high smFSH in Rhodamines.
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Affiliation(s)
- Yang Zhang
- Departments of Biomedical Engineering, Northwestern University, Evanston, IL60208, United States
- Corresponding Author:
| | - Yu Zhang
- Department of Chemistry, Northwestern University, Evanston, IL60208, United States
| | - Ki-Hee Song
- Departments of Biomedical Engineering, Northwestern University, Evanston, IL60208, United States
| | - Wei Lin
- Department of Chemistry, Northwestern University, Evanston, IL60208, United States
| | - Cheng Sun
- Department of Mechanical Engineering, Northwestern University, Evanston, IL60208, United States
| | - George C. Schatz
- Department of Chemistry, Northwestern University, Evanston, IL60208, United States
| | - Hao F. Zhang
- Departments of Biomedical Engineering, Northwestern University, Evanston, IL60208, United States
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11
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Wolz L, Heshmatpour C, Perri A, Polli D, Cerullo G, Finley JJ, Thyrhaug E, Hauer J, Stier AV. Time-domain photocurrent spectroscopy based on a common-path birefringent interferometer. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2020; 91:123101. [PMID: 33379948 DOI: 10.1063/5.0023543] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2020] [Accepted: 11/05/2020] [Indexed: 06/12/2023]
Abstract
We present diffraction-limited photocurrent (PC) microscopy in the visible spectral range based on broadband excitation and an inherently phase-stable common-path interferometer. The excellent path-length stability guarantees high accuracy without the need for active feedback or post-processing of the interferograms. We illustrate the capabilities of the setup by recording PC spectra of a bulk GaAs device and compare the results to optical transmission data.
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Affiliation(s)
- Lukas Wolz
- Department of Physics, Technical University of Munich, Walter Schottky Institut, 85748 Garching, Germany
| | - Constantin Heshmatpour
- Dynamical Spectroscopy, Department of Chemistry, Technical University of Munich, 85748 Garching, Germany
| | - Antonio Perri
- IFN-CNR and Dipartimento di Fisica, Politecnico di Milano, Piazza L. da Vinci 32, 20133 Milano, Italy
| | - Dario Polli
- IFN-CNR and Dipartimento di Fisica, Politecnico di Milano, Piazza L. da Vinci 32, 20133 Milano, Italy
| | - Giulio Cerullo
- IFN-CNR and Dipartimento di Fisica, Politecnico di Milano, Piazza L. da Vinci 32, 20133 Milano, Italy
| | - Jonathan J Finley
- Department of Physics, Technical University of Munich, Walter Schottky Institut, 85748 Garching, Germany
| | - Erling Thyrhaug
- Dynamical Spectroscopy, Department of Chemistry, Technical University of Munich, 85748 Garching, Germany
| | - Jürgen Hauer
- Dynamical Spectroscopy, Department of Chemistry, Technical University of Munich, 85748 Garching, Germany
| | - Andreas V Stier
- Department of Physics, Technical University of Munich, Walter Schottky Institut, 85748 Garching, Germany
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12
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Photon-level broadband spectroscopy and interferometry with two frequency combs. Proc Natl Acad Sci U S A 2020; 117:26688-26691. [PMID: 33055211 PMCID: PMC7604441 DOI: 10.1073/pnas.2010878117] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Significance
Dual-comb spectroscopy has emerged a powerful technique of Fourier transform spectroscopy without moving parts. Broad spectra can be acquired with a single photodetector in any spectral range where laser frequency combs are available. Because the technique is multiplex, systematic effects are minimized and a great consistency of the spectra can be achieved. We show that dual-comb spectroscopy can be implemented with photon-counting instrumentation and work at power levels one-billion-fold weaker than those usually employed. Our demonstration opens many scenarios for applications of this powerful spectroscopic technique.
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13
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Jana S, Shibata Y. Development of a Multicolor Line-Focus Microscope for Rapid Acquisitions of Excitation Spectra. Biophys J 2019; 118:36-43. [PMID: 31839262 DOI: 10.1016/j.bpj.2019.11.023] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2019] [Revised: 11/12/2019] [Accepted: 11/19/2019] [Indexed: 10/25/2022] Open
Abstract
To conduct rapid microscope observations with the excitation spectral measurement for photosynthetic organisms, a wavelength-dispersive line-focus microscope was developed. In the developed system, fluorescence signals at multiple positions on a sample excited with different wavelengths can be detected as a two-dimensional image on the EMCCD camera at the same time. Using the developed system, one can obtain excitation spectra at every pixel over the excitation wavelength range from 635 to 695 nm, which covers the full range of the Qy bands of both chlorophyll-a and chlorophyll-b. Recording the reference laser spectra at the same time ensures robust measurement against the moderate spectral fluctuation in the excitation laser. Using an objective lens with a numerical aperture of 0.9, the lateral and axial resolutions of 0.56 and 1.08 μm, respectively, were achieved. The theoretically limited and experimentally estimated spectral resolutions of the excitation spectral measurement were 0.86 and 1.3 nm, respectively. The validity of the system was demonstrated by measuring fluorescent beads and single cells of a model alga, Chlamydomonas reinhardtii. Intrachloroplast inhomogeneity in the relative intensity of the chlorophyll-b band could be visualized in Chlamydomonas cells. The inhomogeneity reflects the intrachloroplast variation in the local peripheral antenna size.
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Affiliation(s)
- Sankar Jana
- Department of Chemistry, Graduate School of Science, Tohoku University, Sendai, Japan
| | - Yutaka Shibata
- Department of Chemistry, Graduate School of Science, Tohoku University, Sendai, Japan.
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