1
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Boggiano HD, Nan L, Grinblat G, Maier SA, Cortés E, Bragas AV. Focusing Surface Acoustic Waves with a Plasmonic Hypersonic Lens. NANO LETTERS 2024; 24:6362-6368. [PMID: 38752764 DOI: 10.1021/acs.nanolett.4c01251] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2024]
Abstract
Plasmonic nanoantennas have proven to be efficient transducers of electromagnetic to mechanical energy and vice versa. The sudden thermal expansion of these structures after an ultrafast optical pulsed excitation leads to the emission of hypersonic acoustic waves to the supporting substrate, which can be detected by another antenna that acts as a high-sensitivity mechanical probe due to the strong modulation of its optical response. Here, we propose and experimentally demonstrate a nanoscale acoustic lens comprised of 11 gold nanodisks whose collective oscillation at gigahertz frequencies gives rise to an interference pattern that results in a diffraction-limited surface acoustic beam of about 340 nm width, with an amplitude contrast of 60%. Via spatially decoupled pump-probe experiments, we were able to map the radiated acoustic energy in the proximity of the focal area, obtaining a very good agreement with the continuum elastic theory.
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Affiliation(s)
- Hilario D Boggiano
- Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Departamento de Física, 1428 Buenos Aires, Argentina
| | - Lin Nan
- Chair in Hybrid Nanosystems, Nanoinstitute Munich, Faculty of Physics, Ludwig-Maximilians-Universität München, 80539 München, Germany
| | - Gustavo Grinblat
- Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Departamento de Física, 1428 Buenos Aires, Argentina
- CONICET - Universidad de Buenos Aires, Instituto de Física de Buenos Aires (IFIBA), 1428 Buenos Aires, Argentina
| | - Stefan A Maier
- School of Physics and Astronomy, Monash University, Clayton, Victoria 3800, Australia
- Department of Physics, Imperial College London, London SW7 2AZ, U.K
| | - Emiliano Cortés
- Chair in Hybrid Nanosystems, Nanoinstitute Munich, Faculty of Physics, Ludwig-Maximilians-Universität München, 80539 München, Germany
| | - Andrea V Bragas
- Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Departamento de Física, 1428 Buenos Aires, Argentina
- CONICET - Universidad de Buenos Aires, Instituto de Física de Buenos Aires (IFIBA), 1428 Buenos Aires, Argentina
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2
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Saison-Francioso O, Lévêque G, Akjouj A, Pennec Y. Theoretical Study of Gold Nanoparticles Randomly Dispersed on a Dielectric/Gold Substrate. ACS OMEGA 2023; 8:21493-21505. [PMID: 37360435 PMCID: PMC10286086 DOI: 10.1021/acsomega.3c00342] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/17/2023] [Accepted: 03/28/2023] [Indexed: 06/28/2023]
Abstract
We theoretically study random arrangements of cylindrical gold nanoparticles (NPs) deposited on a dielectric/gold substrate. We use two methods, namely the Finite Element Method (FEM) and the Coupled Dipole Approximation (CDA) method. The FEM is increasingly used to analyze the optical properties of NPs, but calculations for arrangements containing a large number of NPs have a high computational cost. On the contrary, the CDA has the advantage to drastically reduce the computation time and the memory demand compared to the FEM. Nevertheless, as the CDA involves modeling each NP as a single electric dipole through the polarizability tensor of a spheroidal-shaped NP, it may be an insufficiently accurate method. Therefore, the main purpose of this article is to verify the validity of using the CDA in order to analyze such a kind of nanosystems. Finally, we capitalize on this methodology to draw some tendencies between statistics of NPs' distributions and the plasmonic properties.
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3
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Yu K, Jiang Y, Chen Y, Hu X, Chang J, Hartland GV, Wang GP. Compressible viscoelasticity of cell membranes determined by gigahertz-frequency acoustic vibrations. PHOTOACOUSTICS 2023; 31:100494. [PMID: 37131996 PMCID: PMC10149280 DOI: 10.1016/j.pacs.2023.100494] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/20/2023] [Revised: 04/09/2023] [Accepted: 04/11/2023] [Indexed: 05/04/2023]
Abstract
Membrane viscosity is an important property of cell biology, which determines cellular function, development and disease progression. Various experimental and computational methods have been developed to investigate the mechanics of cells. However, there have been no experimental measurements of the membrane viscosity at high-frequencies in live cells. High frequency measurements are important because they can probe viscoelastic effects. Here, we investigate the membrane viscosity at gigahertz-frequencies through the damping of the acoustic vibrations of gold nanoplates. The experiments are modeled using a continuum mechanics theory which reveals that the membranes display viscoelasticity, with an estimated relaxation time of ca. 5.7 + 2.4 / - 2.7 ps. We further demonstrate that membrane viscoelasticity can be used to differentiate a cancerous cell line (the human glioblastoma cells LN-18) from a normal cell line (the mouse brain microvascular endothelial cells bEnd.3). The viscosity of cancerous cells LN-18 is lower than that of healthy cells bEnd.3 by a factor of three. The results indicate promising applications of characterizing membrane viscoelasticity at gigahertz-frequency in cell diagnosis.
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Affiliation(s)
- Kuai Yu
- State Key Laboratory of Radio Frequency Heterogeneous Integration, College of Electronics and Information Engineering, Shenzhen University, Shenzhen 518060, China
| | - Yiqi Jiang
- Institute of Microscale Optoelectronics, Shenzhen University, Shenzhen 518060, China
| | - Yungao Chen
- Institute of Microscale Optoelectronics, Shenzhen University, Shenzhen 518060, China
| | - Xiaoyan Hu
- Institute of Biomedicine and Biotechnology, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China
| | - Junlei Chang
- Institute of Biomedicine and Biotechnology, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China
| | - Gregory V. Hartland
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - Guo Ping Wang
- State Key Laboratory of Radio Frequency Heterogeneous Integration, College of Electronics and Information Engineering, Shenzhen University, Shenzhen 518060, China
- Corresponding author.
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4
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Bykov AY, Xie Y, Krasavin AV, Zayats AV. Broadband Transient Response and Wavelength-Tunable Photoacoustics in Plasmonic Hetero-nanoparticles. NANO LETTERS 2023; 23:2786-2791. [PMID: 36926927 PMCID: PMC10103169 DOI: 10.1021/acs.nanolett.3c00063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/06/2023] [Revised: 03/06/2023] [Indexed: 06/18/2023]
Abstract
The optically driven acoustic modes and nonlinear response of plasmonic nanoparticles are important in many applications, but are strongly resonant, which restricts their excitation to predefined wavelengths. Here, we demonstrate that multilayered spherical plasmonic hetero-nanoparticles, formed by alternating layers of gold and silica, provide a platform for a broadband nonlinear optical response from visible to near-infrared wavelengths. They also act as a tunable optomechanical system with mechanically decoupled layers in which different acoustic modes can be selectively switched on/off by tuning the excitation wavelength. These observations not only expand the knowledge about the internal structure of composite plasmonic nanoparticles but also allow for an additional degree of freedom for controlling their nonlinear optical and mechanical properties.
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5
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Indhu AR, Keerthana L, Dharmalingam G. Plasmonic nanotechnology for photothermal applications - an evaluation. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2023; 14:380-419. [PMID: 37025366 PMCID: PMC10071519 DOI: 10.3762/bjnano.14.33] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/27/2022] [Accepted: 03/02/2023] [Indexed: 06/19/2023]
Abstract
The application of plasmonic nanoparticles is motivated by the phenomenon of surface plasmon resonance. Owing to the tunability of optothermal properties and enhanced stability, these nanostructures show a wide range of applications in optical sensors, steam generation, water desalination, thermal energy storage, and biomedical applications such as photothermal (PT) therapy. The PT effect, that is, the conversion of absorbed light to heat by these particles, has led to thriving research regarding the utilization of plasmonic nanoparticles for a myriad of applications. The design of conventional nanomaterials for PT conversion has focussed predominantly on the manipulation of photon absorption through bandgap engineering, doping, incorporation, and modification of suitable matrix materials. Plasmonic nanomaterials offer an alternative and attractive approach in this regard, through the flexibility in the excitation of surface plasmons. Specific advantages are the considerable improved bandwidth of the absorption, a higher efficiency of photon absorption, facile tuning, as well as flexibility in the synthesis of plasmonic nanomaterials. This review of plasmonic PT (PPT) research begins with a theoretical discussion on the plasmonic properties of nanoparticles by means of the quasi-static approximation, Mie theory, Gans theory, generic simulations on common plasmonic material morphologies, and the evaluation processes of PT performance. Further, a variety of nanomaterials and material classes that have potential for PPT conversion are elucidated, such as plasmonic metals, bimetals, and metal-metal oxide nanocomposites. A detailed investigation of the essential, but often ignored, concept of thermal, chemical, and aggregation stability of nanoparticles is another part of this review. The challenges that remain, as well as prospective directions and chemistries, regarding nanomaterials for PT conversion are pondered on in the final section of the article, taking into account the specific requirements from different applications.
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Affiliation(s)
- A R Indhu
- Plasmonic Nanomaterials Laboratory, PSG Institute of Advanced Studies, Coimbatore-641004, India
| | - L Keerthana
- Plasmonic Nanomaterials Laboratory, PSG Institute of Advanced Studies, Coimbatore-641004, India
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6
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Gigahertz optoacoustic vibration in Sub-5 nm tip-supported nano-optomechanical metasurface. Nat Commun 2023; 14:485. [PMID: 36717581 PMCID: PMC9886940 DOI: 10.1038/s41467-023-36127-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2022] [Accepted: 01/18/2023] [Indexed: 01/31/2023] Open
Abstract
The gigahertz acoustic vibration of nano-optomechanical systems plays an indispensable role in all-optical manipulation of light, quantum control of mechanical modes, on-chip data processing, and optomechanical sensing. However, the high optical, thermal, and mechanical energy losses severely limit the development of nano-optomechanical metasurfaces. Here, we demonstrated a high-quality 5 GHz optoacoustic vibration and ultrafast optomechanical all-optical manipulation in a sub-5 nm tip-supported nano-optomechanical metasurface (TSNOMS). The physical rationale is that the design of the semi-suspended metasurface supported by nanotips of <5 nm enhances the optical energy input into the metasurface and closes the mechanical and thermal output loss channels, result in dramatically improvement of the optomechanical conversion efficiency and oscillation quality of the metasurface. The design strategy of a multichannel-loss-mitigating semi-suspended metasurface can be generalized to performance improvements of on-chip processed nano-optomechanical systems. Applications include all-optical operation of nanomechanical systems, reconfigurable nanophotonic devices, optomechanical sensing, and nonlinear and self-adaptive photonic functionalities.
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7
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Ducottet S, El Baroudi A. Small-scale effects on the radial vibration of an elastic nanosphere based on nonlocal strain gradient theory. NANOTECHNOLOGY 2023; 34:115704. [PMID: 36595326 DOI: 10.1088/1361-6528/acab06] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2022] [Accepted: 12/13/2022] [Indexed: 06/17/2023]
Abstract
Nonlocal strain gradient theory is widely used when dealing with micro- and nano-structures. In such framework, small-scale effects cannot be ignored. In this paper a model of radial vibration of an isotropic elastic nanosphere is theoretically investigated. The frequency equation is obtained from a nonlocal elastic constitutive law, based on a mix between local and nonlocal strain. This model is composed of both the classical gradient model and the Eringen's nonlocal elasticity model. To check the validity and accuracy of this theoretical approach, a comparison is made with the literature in certain specific cases, which shows a good agreement. Numerical examples are finally conducted to show the impact of small-scale effects in the radial vibration, which need to be included in the nonlocal strain gradient theory of nanospheres. It reveals that the vibration behavior greatly depends on the nanosphere size and nonlocal and strain gradient parameters. Particularly, when the nanospheres radius is smaller than a critical radius, the small-scale effects play a key role. Thus, the obtained frequency equation for radial vibration is very useful to interpret the experimental measurements of vibrational characteristics of nanospheres.
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Affiliation(s)
- S Ducottet
- LAMPA, Arts et Metiers Institute of Technology, Angers, F-49035, France
| | - A El Baroudi
- LAMPA, Arts et Metiers Institute of Technology, Angers, F-49035, France
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8
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Vasileiadis T, Noual A, Wang Y, Graczykowski B, Djafari-Rouhani B, Yang S, Fytas G. Optomechanical Hot-Spots in Metallic Nanorod-Polymer Nanocomposites. ACS NANO 2022; 16:20419-20429. [PMID: 36475620 PMCID: PMC9798866 DOI: 10.1021/acsnano.2c06673] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/06/2022] [Accepted: 11/28/2022] [Indexed: 06/17/2023]
Abstract
Plasmonic coupling between adjacent metallic nanoparticles can be exploited for acousto-plasmonics, single-molecule sensing, and photochemistry. Light absorption or electron probes can be used to study plasmons and their interactions, but their use is challenging for disordered systems and colloids dispersed in insulating matrices. Here, we investigate the effect of plasmonic coupling on optomechanics with Brillouin light spectroscopy (BLS) in a prototypical metal-polymer nanocomposite, gold nanorods (Au NRs) in polyvinyl alcohol. The intensity of the light inelastically scattered on thermal phonons captured by BLS is strongly affected by the wavelength of the probing light. When light is resonant with the transverse plasmons, BLS reveals mostly the normal vibrational modes of single NRs. For lower energy off-resonant light, BLS is dominated by coupled bending modes of NR dimers. The experimental results, supported by optomechanical calculations, document plasmonically enhanced BLS and reveal energy-dependent confinement of coupled plasmons close to the tips of NR dimers, generating BLS hot-spots. Our work establishes BLS as an optomechanical probe of plasmons and promotes nanorod-soft matter nanocomposites for acousto-plasmonic applications.
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Affiliation(s)
| | - Adnane Noual
- LPMR,
Département de Physique, Faculté des Sciences, Université Mohammed Premier, Oujda, 60000, Morocco
| | - Yuchen Wang
- Department
of Materials Science and Engineering, University
of Pennsylvania, 3231 Walnut Street, Philadelphia, Pennsylvania 19104, United States
| | - Bartlomiej Graczykowski
- Faculty
of Physics, Adam Mickiewicz University, 61-614 Poznan, Poland
- Max
Planck Institute for Polymer Research, 55128 Mainz, Germany
| | - Bahram Djafari-Rouhani
- Département
de Physique, Institut d’Electronique de Microélectonique
et de Nanotechnologie, UMR CNRS 8520, Université
de Lille, Villeneuve
d’Ascq, 59655, France
| | - Shu Yang
- Department
of Materials Science and Engineering, University
of Pennsylvania, 3231 Walnut Street, Philadelphia, Pennsylvania 19104, United States
| | - George Fytas
- Max
Planck Institute for Polymer Research, 55128 Mainz, Germany
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9
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Uthe B, Sader JE, Pelton M. Optical measurement of the picosecond fluid mechanics in simple liquids generated by vibrating nanoparticles: a review. REPORTS ON PROGRESS IN PHYSICS. PHYSICAL SOCIETY (GREAT BRITAIN) 2022; 85:103001. [PMID: 36049471 DOI: 10.1088/1361-6633/ac8e82] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/2022] [Accepted: 09/01/2022] [Indexed: 06/15/2023]
Abstract
Standard continuum assumptions commonly used to describe the fluid mechanics of simple liquids have the potential to break down when considering flows at the nanometer scale. Two common assumptions for simple molecular liquids are that (1) they exhibit a Newtonian response, where the viscosity uniquely specifies the linear relationship between the stress and strain rate, and (2) the liquid moves in tandem with the solid at any solid-liquid interface, known as the no-slip condition. However, even simple molecular liquids can exhibit a non-Newtonian, viscoelastic response at the picosecond time scales that are characteristic of the motion of many nanoscale objects; this viscoelasticity arises because these time scales can be comparable to those of molecular relaxation in the liquid. In addition, even liquids that wet solid surfaces can exhibit nanometer-scale slip at those surfaces. It has recently become possible to interrogate the viscoelastic response of simple liquids and associated nanoscale slip using optical measurements of the mechanical vibrations of metal nanoparticles. Plasmon resonances in metal nanoparticles provide strong optical signals that can be accessed by several spectroscopies, most notably ultrafast transient-absorption spectroscopy. These spectroscopies have been used to measure the frequency and damping rate of acoustic oscillations in the nanoparticles, providing quantitative information about mechanical coupling and exchange of mechanical energy between the solid particle and its surrounding liquid. This information, in turn, has been used to elucidate the rheology of viscoelastic simple liquids at the nanoscale in terms of their constitutive relations, taking into account separate viscoelastic responses for both shear and compressible flows. The nanoparticle vibrations have also been used to provide quantitative measurements of slip lengths on the single-nanometer scale. Viscoelasticity has been shown to amplify nanoscale slip, illustrating the interplay between different aspects of the unconventional fluid dynamics of simple liquids at nanometer length scales and picosecond time scales.
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Affiliation(s)
- Brian Uthe
- Department of Physics, UMBC (University of Maryland, Baltimore County), Baltimore, MD 21250, United States of America
| | - John E Sader
- School of Mathematics and Statistics, The University of Melbourne, Victoria 3010, Australia
| | - Matthew Pelton
- Department of Physics, UMBC (University of Maryland, Baltimore County), Baltimore, MD 21250, United States of America
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10
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Cortés E, Wendisch FJ, Sortino L, Mancini A, Ezendam S, Saris S, de S. Menezes L, Tittl A, Ren H, Maier SA. Optical Metasurfaces for Energy Conversion. Chem Rev 2022; 122:15082-15176. [PMID: 35728004 PMCID: PMC9562288 DOI: 10.1021/acs.chemrev.2c00078] [Citation(s) in RCA: 25] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Nanostructured surfaces with designed optical functionalities, such as metasurfaces, allow efficient harvesting of light at the nanoscale, enhancing light-matter interactions for a wide variety of material combinations. Exploiting light-driven matter excitations in these artificial materials opens up a new dimension in the conversion and management of energy at the nanoscale. In this review, we outline the impact, opportunities, applications, and challenges of optical metasurfaces in converting the energy of incoming photons into frequency-shifted photons, phonons, and energetic charge carriers. A myriad of opportunities await for the utilization of the converted energy. Here we cover the most pertinent aspects from a fundamental nanoscopic viewpoint all the way to applications.
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Affiliation(s)
- Emiliano Cortés
- Chair
in Hybrid Nanosystems, Nano Institute Munich, Faculty of Physics, Ludwig-Maximilians-University Munich, Königinstraße 10, 80539 Munich, Germany
| | - Fedja J. Wendisch
- Chair
in Hybrid Nanosystems, Nano Institute Munich, Faculty of Physics, Ludwig-Maximilians-University Munich, Königinstraße 10, 80539 Munich, Germany
| | - Luca Sortino
- Chair
in Hybrid Nanosystems, Nano Institute Munich, Faculty of Physics, Ludwig-Maximilians-University Munich, Königinstraße 10, 80539 Munich, Germany
| | - Andrea Mancini
- Chair
in Hybrid Nanosystems, Nano Institute Munich, Faculty of Physics, Ludwig-Maximilians-University Munich, Königinstraße 10, 80539 Munich, Germany
| | - Simone Ezendam
- Chair
in Hybrid Nanosystems, Nano Institute Munich, Faculty of Physics, Ludwig-Maximilians-University Munich, Königinstraße 10, 80539 Munich, Germany
| | - Seryio Saris
- Chair
in Hybrid Nanosystems, Nano Institute Munich, Faculty of Physics, Ludwig-Maximilians-University Munich, Königinstraße 10, 80539 Munich, Germany
| | - Leonardo de S. Menezes
- Chair
in Hybrid Nanosystems, Nano Institute Munich, Faculty of Physics, Ludwig-Maximilians-University Munich, Königinstraße 10, 80539 Munich, Germany
- Departamento
de Física, Universidade Federal de
Pernambuco, 50670-901 Recife, Pernambuco, Brazil
| | - Andreas Tittl
- Chair
in Hybrid Nanosystems, Nano Institute Munich, Faculty of Physics, Ludwig-Maximilians-University Munich, Königinstraße 10, 80539 Munich, Germany
| | - Haoran Ren
- MQ Photonics
Research Centre, Department of Physics and Astronomy, Macquarie University, Macquarie
Park, New South Wales 2109, Australia
| | - Stefan A. Maier
- Chair
in Hybrid Nanosystems, Nano Institute Munich, Faculty of Physics, Ludwig-Maximilians-University Munich, Königinstraße 10, 80539 Munich, Germany
- School
of Physics and Astronomy, Monash University, Clayton, Victoria 3800, Australia
- Department
of Phyiscs, Imperial College London, London SW7 2AZ, United Kingdom
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11
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Ahmed A, Gelfand R, Storm SD, Lee A, Klinkova A, Guest JR, Pelton M. Low-Frequency Oscillations in Optical Measurements of Metal-Nanoparticle Vibrations. NANO LETTERS 2022; 22:5365-5371. [PMID: 35699569 DOI: 10.1021/acs.nanolett.2c01339] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Time-resolved optical measurements of vibrating metal nanoparticles have been used extensively to probe the ultrafast mechanical properties of the nanoparticles and of the surrounding liquid, but nearly all investigations so far have been limited to the linear regime. Here, we report the observation of a low-frequency oscillating signal in transient-absorption measurements of nanoparticles with octahedral gold cores and cubic silver shells; the signal appears at the difference of two mechanical vibrational frequencies in the particles, suggesting a nonlinear mixing process. We tentatively attribute this proposed mixing to a nonlinear coupling between a vibrational mode of the nanoparticle and its optical-frequency plasmon resonance. The optimization of this nonlinear transduction may enable high-efficiency opto-mechanical frequency mixing in the GHz-THz frequency regime.
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Affiliation(s)
- Aftab Ahmed
- Department of Electrical Engineering, California State University, Long Beach, California 90840, United States
| | - Rachel Gelfand
- Department of Physics, University of Maryland, Baltimore County, Baltimore, Maryland 21250, United States
| | - S David Storm
- Department of Physics, University of Maryland, Baltimore County, Baltimore, Maryland 21250, United States
| | - Anna Lee
- Department of Chemistry and Biochemistry, University of Minnesota, Duluth, Minnesota 55812, United States
| | - Anna Klinkova
- Department of Chemistry, University of Waterloo, 200 University Ave., Waterloo, Ontario N2L 3G1, Canada
| | - Jeffrey R Guest
- Center for Nanoscale Materials, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Matthew Pelton
- Department of Physics, University of Maryland, Baltimore County, Baltimore, Maryland 21250, United States
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12
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Abstract
Due to the complexity of heterogeneous reactions and heterogeneities of individual catalyst particles in size, morphology, and the surrounding medium, it is very important to characterize the structure of nanocatalysts and measure the reaction process of nanocatalysis at the single-particle level. Traditional ensemble measurements, however, only provide averaged results of billions of nanoparticles (NPs), which do not help reveal structure–activity relationships and may overlook a few NPs with high activity. The advent of dark-field microscopy (DFM) combined with plasmonic resonance Rayleigh scattering (PRRS) spectroscopy provides a powerful means for directly recording the localized surface plasmon resonance (LSPR) spectrum of single plasmonic nanoparticles (PNPs), which also enables quantitative measurements. In recent years, DFM has developed rapidly for a series of single-particle catalytic reactions such as redox reactions, electrocatalytic reactions, and DNAzyme catalysis, with the ability to monitor the catalytic reaction process in real time and reveal the catalytic mechanism. This review provides a comprehensive overview of the fundamental principles and practical applications of DFM in measuring various kinds of catalysis (including chemocatalysis, electrocatalysis, photocatalysis, and biocatalysis) at the single-particle level. Perspectives on the remaining challenges and future trends in this field are also proposed.
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13
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Acoustic Vibration Modes of Gold–Silver Core–Shell Nanoparticles. CHEMOSENSORS 2022. [DOI: 10.3390/chemosensors10050193] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Bimetallic Au/Ag core–shell cuboid nanoparticles (NPs) exhibit a complex plasmonic response dominated by a dipolar longitudinal mode and higher-order transverse modes in the near-UV, which may be exploited for a range of applications. In this paper, we take advantage of the strong signature of these modes in the NP ultrafast transient optical response, measured by pump-probe transient absorption (TA) spectroscopy, to explore the NP vibrational landscape. The fast Fourier transform analysis of the TA dynamics reveals specific vibration modes in the frequency range 15–150 GHz, further studied by numerical simulations based on the finite element method. While bare Au nanorods exhibit extensional and breathing modes, the bimetallic NPs undergo more complex motions, involving the displacement of facets, edges and corners. The amplitude and frequency of these modes are shown to depend on the Ag shell thickness, as the silver load modifies the NP aspect ratio and mass. Moreover, the contributions of the vibrational modes to the experimental TA spectra are shown to vary with the probe laser wavelength at which the signal is monitored. Using the combined simulations of the NP elastic and optical properties, we elucidate this influence by analyzing the effect of the mechanisms involved in the acousto-plasmonic coupling.
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14
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Noual A, Kang E, Maji T, Gkikas M, Djafari-Rouhani B, Fytas G. Optomechanic Coupling in Ag Polymer Nanocomposite Films. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2021; 125:14854-14864. [PMID: 34295447 PMCID: PMC8287562 DOI: 10.1021/acs.jpcc.1c04549] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2021] [Revised: 06/15/2021] [Indexed: 05/08/2023]
Abstract
Particle vibrational spectroscopy has emerged as a new tool for the measurement of elasticity, glass transition, and interactions at a nanoscale. For colloid-based materials, however, the weakly localized particle resonances in a fluid or solid medium renders their detection difficult. The strong amplification of the inelastic light scattering near surface plasmon resonance of metallic nanoparticles (NPs) allowed not only the detection of single NP eigenvibrations but also the interparticle interaction effects on the acoustic vibrations of NPs mediated by strong optomechanical coupling. The "rattling" and quadrupolar modes of Ag/polymer and polymer-grafted Ag NPs with different diameters in their assemblies are probed by Brillouin light spectroscopy (BLS). We present thorough theoretical 3D calculations for anisotropic Ag elasticity to quantify the frequency and intensity of the "rattling" mode and hence its BLS activity for different interparticle separations and matrix rigidity. Theoretically, a liquidlike environment, e.g., poly(isobutylene) (PIB) does not support rattling vibration of Ag dimers but unexpectedly hardening of the extremely confined graft melt renders both activation of the former and a frequency blue shift of the fundamental quadrupolar mode in the grafted nanoparticle Ag@PIB film.
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Affiliation(s)
- Adnane Noual
- Faculté
Pluridisciplinaire Nador, LPMR, Université
Mohammed Premier, Oujda BP 717-60 000, Morocco
| | - Eunsoo Kang
- Max
Planck Institute for Polymer Research, Ackermannweg 10, Mainz 55128, Germany
| | - Tanmoy Maji
- Department
of Chemistry, University of Massachusetts
Lowell, Lowell, Massachusetts 01854, United States
| | - Manos Gkikas
- Department
of Chemistry, University of Massachusetts
Lowell, Lowell, Massachusetts 01854, United States
| | - Bahram Djafari-Rouhani
- Institut
d’Électronique, de Microélectronique et de Nanotechnologie
(IEMN), UMR-CNRS 8520, Department of Physics, University of Lille, Villeneuve d’Ascq 59655, France
| | - George Fytas
- Max
Planck Institute for Polymer Research, Ackermannweg 10, Mainz 55128, Germany
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15
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Uthe B, Collis JF, Madadi M, Sader JE, Pelton M. Highly Spherical Nanoparticles Probe Gigahertz Viscoelastic Flows of Simple Liquids Without the No-Slip Condition. J Phys Chem Lett 2021; 12:4440-4446. [PMID: 33955224 DOI: 10.1021/acs.jpclett.1c01013] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Simple liquids are conventionally described by Newtonian fluid mechanics, based on the assumption that relaxation processes in the flow occur much faster than the rate at which the fluid is driven. Nanoscale solids, however, have characteristic mechanical response times on the picosecond scale, which are comparable to mechanical relaxation times in simple liquids; as a result, viscoelastic effects in the liquid must be considered. These effects have been observed using time-resolved optical measurements of vibrating nanoparticles, but interpretation has often been complicated by finite velocity slip at the liquid-solid interface. Here, we use highly spherical gold nanoparticles to drive flows that are theoretically modeled without the use of the no-slip boundary condition at the particle surface. We obtain excellent agreement with this analytical theory that considers both the compression and shear relaxation properties of the liquid.
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Affiliation(s)
- Brian Uthe
- Department of Physics, UMBC (University of Maryland, Baltimore County), Baltimore, Maryland 21250, United States
| | - Jesse F Collis
- ARC Centre of Excellence in Exciton Science, School of Mathematics and Statistics, The University of Melbourne, Melbourne, Victoria 3010, Australia
| | - Mahyar Madadi
- ARC Centre of Excellence in Exciton Science, School of Mathematics and Statistics, The University of Melbourne, Melbourne, Victoria 3010, Australia
| | - John E Sader
- ARC Centre of Excellence in Exciton Science, School of Mathematics and Statistics, The University of Melbourne, Melbourne, Victoria 3010, Australia
| | - Matthew Pelton
- Department of Physics, UMBC (University of Maryland, Baltimore County), Baltimore, Maryland 21250, United States
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16
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Lindley SA, An Q, Goddard WA, Cooper JK. Spatiotemporal Temperature and Pressure in Thermoplasmonic Gold Nanosphere-Water Systems. ACS NANO 2021; 15:6276-6288. [PMID: 33621047 DOI: 10.1021/acsnano.0c09804] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
We offer a detailed investigation of the photophysical properties of plasmonic solid and hollow gold nanospheres suspended in water by combining ultrafast transient absorption (TA) spectroscopy with molecular dynamics (MD) simulations. TA reveals that hollow gold nanospheres (HGNs) exhibit faster excited state relaxation and larger amplitude acoustic phonon modes than solid gold nanoparticles of the same outer diameter. MD simulation carried out on full scale nanoparticle-water models (over 10 million atoms) to simulate the temporal evolution (0-100 ps) of the thermally excited particles (1000 or 1250 K) provides atomic-scale resolution of the spatiotemporal temperature and pressure maps, as well as visualization of the lattice vibrational modes. For the 1000 K HGN, temperatures upward of 500 K in the vicinity of the shell surface were observed, along with pressures up to several hundred MPa in the inner cavity, revealing potential use as a photoinduced nanoreactor. Our approach of combining TA and MD provides a path to better understanding how thermal-structural properties (such as expansion and contraction) and thermal-optical properties (such as modulated dielectrics) manifest themselves as TA signatures. The detailed picture of heat transfer at interfaces should help guide nanoparticle design for a wide range of applications that rely on photothermal conversion, including photothermal coupling agents for nanoparticle-mediated photothermal therapy and photocatalysts for light-driven chemical reactions.
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Affiliation(s)
- Sarah A Lindley
- Chemical Sciences Division, Joint Center for Artificial Photosynthesis, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Qi An
- Department of Chemical and Materials Engineering, University of Nevada, Reno, Nevada 89577, United States
| | - William A Goddard
- Materials and Procs Simulation Center (MSC), California Institute of Technology, Pasadena, California 91125, United States
| | - Jason K Cooper
- Chemical Sciences Division, Joint Center for Artificial Photosynthesis, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
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17
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Chakraborty D, Uthe B, Malachosky EW, Pelton M, Sader JE. Viscoelasticity Enhances Nanometer-Scale Slip in Gigahertz-Frequency Liquid Flows. J Phys Chem Lett 2021; 12:3449-3455. [PMID: 33789041 DOI: 10.1021/acs.jpclett.1c00600] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The interaction between flowing liquids and solid surfaces underpins many physical phenomena and technologies, such as the ability of an airfoil to generate lift and the mixing of liquids for industrial applications. These phenomena are often described using the Navier-Stokes equations and the no-slip boundary condition: the assumption that the liquid immediately adjacent to a solid surface does not move relative to the surface. Herein, we observe violation of the no-slip condition with strong enhancement of slip due to intrinsic viscoelasticity of the bulk liquid. This is achieved by measuring the 20 GHz acoustic vibrations of gold nanoparticles in glycerol/water mixtures, for which the underlying physics is explored using rigorous, theoretical models. The reported enhancement of slip revises current understanding of ultrafast liquid flows, with implications for technologies ranging from membrane filtration to nanofluidic devices and biomolecular sensing.
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Affiliation(s)
- Debadi Chakraborty
- ARC Centre of Excellence in Exciton Science, School of Mathematics and Statistics, The University of Melbourne, Victoria 3010, Australia
| | - Brian Uthe
- Department of Physics, UMBC (University of Maryland, Baltimore County), Baltimore, Maryland 21250, United States
| | - Edward W Malachosky
- James Franck Institute, University of Chicago, Chicago, Illinois 60637, United States
| | - Matthew Pelton
- Department of Physics, UMBC (University of Maryland, Baltimore County), Baltimore, Maryland 21250, United States
| | - John E Sader
- ARC Centre of Excellence in Exciton Science, School of Mathematics and Statistics, The University of Melbourne, Victoria 3010, Australia
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18
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Wang L, Takeda S, Sato R, Sakamoto M, Teranishi T, Tamai N. Morphology-Dependent Coherent Acoustic Phonon Vibrations and Phonon Beat of Au Nanopolyhedrons. ACS OMEGA 2021; 6:5485-5489. [PMID: 33681589 PMCID: PMC7931377 DOI: 10.1021/acsomega.0c05806] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Accepted: 01/25/2021] [Indexed: 06/06/2023]
Abstract
Coherent acoustic phonon vibrations of Au nanopolyhedrons, including nanocubes, nano-octahedrons, and nanocuboctahedrons, in aqueous solutions and poly(vinyl alcohol) (PVA) films, were investigated using transient absorption (TA) spectroscopy combined with finite element analysis based on continuum elastic theory. In each type of nanopolyhedron, two vibrational modes with similar quality factors (Qs) and phases were observed, suggesting that both were induced by thermal expansion. The low-frequency vibrational mode represents a tip-to-tip displacement in each nanopolyhedron, whereas the high-frequency mode is the breathing vibration of the whole particle and reveals morphology dependence, displaying a face-to-face displacement in nanocuboctahedrons, an edge-to-edge displacement in nano-octahedrons, and a combination of face-to-face and edge-to-edge displacements in nanocubes. Moreover, a clear phonon beat was identified in the two vibrational modes of the nanocuboctahedrons. Our experimental results provide a possible application of morphology-controllable metal nanoresonators.
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Affiliation(s)
- Li Wang
- Department
of Chemistry, School of Science and Technology, Kwansei Gakuin University, 2-1 Gakuen, Sanda 669-1337, Japan
| | - Shohei Takeda
- Department
of Chemistry, School of Science and Technology, Kwansei Gakuin University, 2-1 Gakuen, Sanda 669-1337, Japan
| | - Ryota Sato
- Institute
for Chemical Research, Kyoto University, Gokasho Uji, Kyoto 611-0011, Japan
| | - Masanori Sakamoto
- Institute
for Chemical Research, Kyoto University, Gokasho Uji, Kyoto 611-0011, Japan
| | - Toshiharu Teranishi
- Institute
for Chemical Research, Kyoto University, Gokasho Uji, Kyoto 611-0011, Japan
| | - Naoto Tamai
- Department
of Chemistry, School of Science and Technology, Kwansei Gakuin University, 2-1 Gakuen, Sanda 669-1337, Japan
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19
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Ranjana R, Parushuram N, Harisha KS, Narayana B, Sangappa Y. Photo-Driven Synthesis of Anisotropic Gold Nanoparticles Using Silk Fibroin—Cell Viability Activities in Lymphocyte and Jurkat Cancer Cells. BIONANOSCIENCE 2020. [DOI: 10.1007/s12668-020-00772-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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20
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Portalès H, Goubet N, Casale S, Xu XZ, Ariane M, Mermet A, Margueritat J, Saviot L. Inelastic Light Scattering by Long Narrow Gold Nanocrystals: When Size, Shape, Crystallinity, and Assembly Matter. ACS NANO 2020; 14:4395-4404. [PMID: 32167742 DOI: 10.1021/acsnano.9b09993] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
We report the synthesis of long narrow gold nanocrystals and the study of their vibrational dynamics using inelastic light-scattering measurements. Rich experimental spectra are obtained for monodomain gold nanorods and pentagonal twinned bipyramids. Their assignment involves diameter-dependent nontotally symmetric vibrations which are modeled in the framework of continuum elasticity by taking into account simultaneously the size, shape, and crystallinity of the nanocrystals. Light scattering by vibrations with angular momenta larger than 2 is reported. It is shown to increase with the ratio of the nanocrystals diameter to the interparticle separation. It originates from the plasmonic coupling due to the self-assembly of the nanocrystals after deposition.
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Affiliation(s)
- Hervé Portalès
- Sorbonne Université, CNRS, MONARIS, UMR 8233, 4 place Jussieu, 75005 Paris, France
| | - Nicolas Goubet
- Sorbonne Université, CNRS, MONARIS, UMR 8233, 4 place Jussieu, 75005 Paris, France
| | - Sandra Casale
- Sorbonne Université, CNRS, LRS, UMR 7197, 4 Place Jussieu, 75005 Paris, France
| | - Xiang Zhen Xu
- LPEM, ESPCI Paris, PSL University, CNRS, 75005 Paris, France
- Sorbonne Université, CNRS, LPEM, UMR 8213, 4 place Jussieu, 75005 Paris, France
| | | | - Alain Mermet
- Institut Lumière Matière, UMR 5306, Université Lyon 1-CNRS, Université de Lyon, 69622 Villeurbanne, France
| | - Jérémie Margueritat
- Institut Lumière Matière, UMR 5306, Université Lyon 1-CNRS, Université de Lyon, 69622 Villeurbanne, France
| | - Lucien Saviot
- Laboratoire Interdisciplinaire Carnot de Bourgogne, UMR 6303 CNRS-Université Bourgogne Franche-Comté, 9 Avenue Alain Savary, BP 47 870, 21078DijonCedex, France
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21
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Medeghini F, Rouxel R, Crut A, Maioli P, Rossella F, Banfi F, Vallée F, Del Fatti N. Signatures of Small Morphological Anisotropies in the Plasmonic and Vibrational Responses of Individual Nano-objects. J Phys Chem Lett 2019; 10:5372-5380. [PMID: 31449419 DOI: 10.1021/acs.jpclett.9b01898] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The plasmonic and vibrational properties of single gold nanodisks patterned on a sapphire substrate are investigated via spatial modulation and pump-probe optical spectroscopies. The features of the measured extinction spectra and time-resolved signals are highly sensitive to minute deviations of the nanodisk morphology from a perfectly cylindrical one. An elliptical nanodisk section, as compared to a circular one, lifts the degeneracy of the two nanodisk in-plane dipolar surface plasmon resonances, which can be selectively excited by controlling the polarization of the incident light. This splitting effect, whose amplitude increases with nanodisk ellipticity, correlates with the detection of additional vibrational modes in the context of time-resolved spectroscopy. Analysis of the measurements is performed through the combination of optical and acoustic numerical models. This allows us first to estimate the dimensions of the investigated nanodisks from their plasmonic response and then to compare the measured and computed frequencies of their detectable vibrational modes, which are found to be in excellent agreement. This study demonstrates that single-particle optical spectroscopies are able to provide access to fine morphological characteristics, representing in this case a valuable alternative to traditional techniques aimed at postfabrication inspection of subwavelength nanodevice morphology.
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Affiliation(s)
- Fabio Medeghini
- FemtoNanoOptics group , Université de Lyon, CNRS, Université Claude Bernard Lyon 1, Institut Lumière Matière , F-69622 Villeurbanne , France
| | - Romain Rouxel
- FemtoNanoOptics group , Université de Lyon, CNRS, Université Claude Bernard Lyon 1, Institut Lumière Matière , F-69622 Villeurbanne , France
| | - Aurélien Crut
- FemtoNanoOptics group , Université de Lyon, CNRS, Université Claude Bernard Lyon 1, Institut Lumière Matière , F-69622 Villeurbanne , France
| | - Paolo Maioli
- FemtoNanoOptics group , Université de Lyon, CNRS, Université Claude Bernard Lyon 1, Institut Lumière Matière , F-69622 Villeurbanne , France
| | - Francesco Rossella
- NEST , Scuola Normale Superiore and Istituto Nanoscienze-CNR , Piazza S. Silvestro 12 , I-56124 Pisa , Italy
| | - Francesco Banfi
- FemtoNanoOptics group , Université de Lyon, CNRS, Université Claude Bernard Lyon 1, Institut Lumière Matière , F-69622 Villeurbanne , France
- Interdisciplinary Laboratories for Advanced Materials Physics (I-LAMP) , Università Cattolica del Sacro Cuore , I-25121 Brescia , Italy
| | - Fabrice Vallée
- FemtoNanoOptics group , Université de Lyon, CNRS, Université Claude Bernard Lyon 1, Institut Lumière Matière , F-69622 Villeurbanne , France
| | - Natalia Del Fatti
- FemtoNanoOptics group , Université de Lyon, CNRS, Université Claude Bernard Lyon 1, Institut Lumière Matière , F-69622 Villeurbanne , France
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22
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Gan Y, Sun Z. Crystal structure dependence of the breathing vibration of individual gold nanodisks induced by the ultrafast laser. APPLIED OPTICS 2019; 58:213-218. [PMID: 30645531 DOI: 10.1364/ao.58.000213] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2018] [Accepted: 11/29/2018] [Indexed: 06/09/2023]
Abstract
The ultrafast laser-excited breathing vibrations of gold nanodisks with different crystal structures have been studied via atomistic simulations. The vibrational periods and damping rates of nanodisks are obtained by the analysis of the simulated transient responses of nanodisks. It is shown that the breathing period of nanodisks is considerably dependent on their crystal structure, which is contrary to the cases for the breathing vibration of metal nanospheres and nanorods. Furthermore, single-crystal nanodisks exhibit much lower intrinsic damping as compared with polycrystalline nanodisks, for which the additional energy dissipation by the grain boundaries in the polycrystalline nanodisks could be one major factor.
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23
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Beane G, Devkota T, Brown BS, Hartland GV. Ultrafast measurements of the dynamics of single nanostructures: a review. REPORTS ON PROGRESS IN PHYSICS. PHYSICAL SOCIETY (GREAT BRITAIN) 2019; 82:016401. [PMID: 30485256 DOI: 10.1088/1361-6633/aaea4b] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The ability to study single particles has revolutionized nanoscience. The advantage of single particle spectroscopy measurements compared to conventional ensemble studies is that they remove averaging effects from the different sizes and shapes that are present in the samples. In time-resolved experiments this is important for unraveling homogeneous and inhomogeneous broadening effects in lifetime measurements. In this report, recent progress in the development of ultrafast time-resolved spectroscopic techniques for interrogating single nanostructures will be discussed. The techniques include far-field experiments that utilize high numerical aperture (NA) microscope objectives, near-field scanning optical microscopy (NSOM) measurements, ultrafast electron microscopy (UEM), and time-resolved x-ray diffraction experiments. Examples will be given of the application of these techniques to studying energy relaxation processes in nanoparticles, and the motion of plasmons, excitons and/or charge carriers in different types of nanostructures.
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Affiliation(s)
- Gary Beane
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN 46556, United States of America
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24
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Berte R, Della Picca F, Poblet M, Li Y, Cortés E, Craster RV, Maier SA, Bragas AV. Acoustic Far-Field Hypersonic Surface Wave Detection with Single Plasmonic Nanoantennas. PHYSICAL REVIEW LETTERS 2018; 121:253902. [PMID: 30608776 DOI: 10.1103/physrevlett.121.253902] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2018] [Indexed: 06/09/2023]
Abstract
The optical properties of small metallic particles allow us to bridge the gap between the myriad of subdiffraction local phenomena and macroscopic optical elements. The optomechanical coupling between mechanical vibrations of Au nanoparticles and their optical response due to collective electronic oscillations leads to the emission and the detection of surface acoustic waves (SAWs) by single metallic nanoantennas. We take two Au nanoparticles, one acting as a source and the other as a receptor of SAWs and, even though these antennas are separated by distances orders of magnitude larger than the characteristic subnanometric displacements of vibrations, we probe the frequency content, wave speed, and amplitude decay of SAWs originating from the damping of coherent mechanical modes of the source. Two-color pump-probe experiments and numerical methods reveal the characteristic Rayleigh wave behavior of emitted SAWs, and show that the SAW-induced optical modulation of the receptor antenna allows us to accurately probe the frequency of the source, even when the eigenmodes of source and receptor are detuned.
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Affiliation(s)
- Rodrigo Berte
- The Blackett Laboratory, Department of Physics, Imperial College London, London SW7 2AZ, United Kingdom
- CAPES Foundation, Ministry of Education of Brazil, Brasília, DF 70040-020, Brazil
| | - Fabricio Della Picca
- Departamento de Física, FCEN, IFIBA CONICET, Universidad de Buenos Aires, Intendente Güiraldes 2160, C1428EGA Buenos Aires, Argentina
| | - Martín Poblet
- Departamento de Física, FCEN, IFIBA CONICET, Universidad de Buenos Aires, Intendente Güiraldes 2160, C1428EGA Buenos Aires, Argentina
| | - Yi Li
- The Blackett Laboratory, Department of Physics, Imperial College London, London SW7 2AZ, United Kingdom
| | - Emiliano Cortés
- The Blackett Laboratory, Department of Physics, Imperial College London, London SW7 2AZ, United Kingdom
- Chair in Hybrid Nanosystems, Nanoinstitut München, Fakultät für Physik, Ludwig-Maximilians-Universität München, 80799 München, Germany
| | - Richard V Craster
- Department of Mathematics, Imperial College, London SW7 2AZ, United Kingdom
| | - Stefan A Maier
- The Blackett Laboratory, Department of Physics, Imperial College London, London SW7 2AZ, United Kingdom
- Chair in Hybrid Nanosystems, Nanoinstitut München, Fakultät für Physik, Ludwig-Maximilians-Universität München, 80799 München, Germany
| | - Andrea V Bragas
- Departamento de Física, FCEN, IFIBA CONICET, Universidad de Buenos Aires, Intendente Güiraldes 2160, C1428EGA Buenos Aires, Argentina
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25
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Schmidt MK, Helt LG, Poulton CG, Steel MJ. Elastic Purcell Effect. PHYSICAL REVIEW LETTERS 2018; 121:064301. [PMID: 30141687 DOI: 10.1103/physrevlett.121.064301] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/14/2018] [Indexed: 06/08/2023]
Abstract
In this work, we introduce an elastic analog of the Purcell effect and show theoretically that spherical nanoparticles can serve as tunable and robust antennas for modifying the emission from localized elastic sources. This effect can be qualitatively described by introducing elastic counterparts of the familiar electromagnetic parameters: local density of elastic states, elastic Purcell factor, and effective volume of elastic modes. To illustrate our framework, we consider the example of a submicron gold sphere as a generic elastic GHz antenna and find that shear and mixed modes of low orders in such systems offer considerable elastic Purcell factors. This formalism opens pathways towards extended control over dissipation of vibrations in various optomechanical systems and contributes to closing the gap between classical and quantum-mechanical treatments of phonons localized in elastic nanoresonators.
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Affiliation(s)
- Mikołaj K Schmidt
- Centre for Ultrahigh bandwidth Devices for Optical Systems (CUDOS), Australia
- Macquarie University Research Centre in Quantum Science and Technology (QSciTech), MQ Photonics Research Centre, Department of Physics and Astronomy, Macquarie University, New South Wales 2109, Australia
| | - L G Helt
- Department of Physics, Engineering Physics & Astronomy, Queen's University, Kingston, Ontario, K7L 3N6, Canada
| | - Christopher G Poulton
- Centre for Ultrahigh bandwidth Devices for Optical Systems (CUDOS), Australia
- School of Mathematical and Physical Sciences, University of Technology Sydney, New South Wales 2007, Australia
| | - M J Steel
- Centre for Ultrahigh bandwidth Devices for Optical Systems (CUDOS), Australia
- Macquarie University Research Centre in Quantum Science and Technology (QSciTech), MQ Photonics Research Centre, Department of Physics and Astronomy, Macquarie University, New South Wales 2109, Australia
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26
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Amplitude-modulated acoustic waves by nonlinear optical signals in bimetallic Au-Pt nanoparticles and ethanol based nanofluids. J Mol Liq 2018. [DOI: 10.1016/j.molliq.2018.05.019] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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27
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Yu SJ, Ouyang M. Coherent Discriminatory Modal Manipulation of Acoustic Phonons at the Nanoscale. NANO LETTERS 2018; 18:1124-1129. [PMID: 29314852 DOI: 10.1021/acs.nanolett.7b04662] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Understanding and controlling the phononic characteristics in solids is crucial to elucidate many physical phenomena and develop new phononic devices with optimal performance. Although substantial progress on the spatial control of phonons by material design has been achieved, the manipulation of phonons in the time domain has been less studied but can elucidate in-depth insight into various phonon-coupling processes. In this work, we explore different time-domain pump-control(s)-probe phonon manipulation schemes in both simulations and experiments with good consistency. In particular, we use an Au-Ag core-shell nanoparticle with a manifestation of multiple phonon vibrational modes as a model system for multimodal-phonon manipulation, and we demonstrate that the simple addition of a femtosecond optical control pulse to an all-optical pump-probe phonon measurement can enhance or suppress the fundamental breathing phonon mode of nanoparticles depending on the time separation between the pump and the control pulses. A more advanced control of the higher-order phonon modes and their interplay has also been achieved using two sequential and independently tunable optical control pulses, which enables the discriminatory modal manipulation of phonons for the first time. This work represents a significant step toward a deep understanding of the phonon-mediated physical and chemical processes and a development of new nanoscale materials with desirable functionalities and properties.
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Affiliation(s)
- Shang-Jie Yu
- Department of Physics and Center for Nanophysics and Advanced Materials and ‡Department of Electrical and Computer Engineering, University of Maryland , College Park, Maryland 20742, United States
| | - Min Ouyang
- Department of Physics and Center for Nanophysics and Advanced Materials and ‡Department of Electrical and Computer Engineering, University of Maryland , College Park, Maryland 20742, United States
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