Wavelength-tuneable photoacoustics in plasmonic Au/SiO2/Au nanoparticles

Yuanyang Xie; Anton Bykov; Alexey Krasavin; Pang Wang; Anatoly Zayats

doi:10.1117/12.2621825

24 May 2022 Wavelength-tuneable photoacoustics in plasmonic Au/SiO2/Au nanoparticles

Yuanyang Xie, Anton Bykov, Alexey Krasavin, Pang Wang, Anatoly Zayats

Proceedings Volume PC12131, Nanophotonics IX; PC121310M (2022) https://doi.org/10.1117/12.2621825
Event: SPIE Photonics Europe, 2022, Strasbourg, France

Abstract

Acoustic vibrations of nanoparticles have raised a significant interest due to the potential to study mechanical phenomena at nanometer length scales. We investigated the transient optical response of multilayer spherical plasmonic nanoparticles formed by alternating layers of gold and silica. The nanoparticles provide a platform for a broadband nonlinear optical response from visible to near-IR spectral ranges as well as a tunable optomechanical system in which different acoustic modes can be selectively switched on/off tuning the excitation wavelength. The nonlinear response monitored through the transient absorption spectra, follows the linear optical properties of the nanoparticles with the transient signal decay relatively independent of the pump wavelength in the visible (514 nm) and infrared (1028 nm). At both pump wavelengths, more than one vibration mode is excited on the nanoparticles. The numerical modelling allows differentiating the core and shell vibrations excited at different pump wavelengths. In addition to two vibration modes which can be excited at both pump wavelengths, and related to the shell vibrations, the acoustic vibration existed by the 514 nm pump illumination can be assigned to the nanoparticle core. The observed behaviour shows that different vibrational modes of the nanoparticle can be independently optically excited by tuning the wavelength of the excitation. This observation not only expands the knowledge about the internal structure of composite plasmonic nanoparticles but also allows for the additional degree of freedom to control their optical and mechanical properties.

Conference Presentation

Citation Download Citation

Yuanyang Xie, Anton Bykov, Alexey Krasavin, Pang Wang, and Anatoly Zayats "Wavelength-tuneable photoacoustics in plasmonic Au/SiO2/Au nanoparticles", Proc. SPIE PC12131, Nanophotonics IX, PC121310M (24 May 2022); https://doi.org/10.1117/12.2621825

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KEYWORDS

Nanoparticles

Plasmonics

Photoacoustic spectroscopy

Acoustics

Transient nonlinear optics

Visible radiation

Numerical modeling

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