Ultrasensitive Characterization of Mechanical Oscillations and Plasmon Energy Shift in Gold Nanorods

ACS Nano
Giancarlo SoaviGiulio Cerullo

Abstract

Mechanical vibrational resonances in metal nanoparticles are intensively studied because they provide insight into nanoscale elasticity and for their potential application to ultrasensitive mass detection. In this paper, we use broadband femtosecond pump-probe spectroscopy to study the longitudinal acoustic phonons of arrays of gold nanorods with different aspect ratios, fabricated by electron beam lithography with very high size uniformity. We follow in real time the impulsively excited extensional oscillations of the nanorods by measuring the transient shift of the localized surface plasmon band. Broadband and high-sensitivity detection of the time-dependent extinction spectra enables one to develop a model that quantitatively describes the periodic variation of the plasmon extinction coefficient starting from the steady-state spectrum with only one additional free parameter. This model allows us to retrieve the time-dependent elongation of the nanorods with an ultrahigh sensitivity and to measure oscillation amplitudes of just a few picometers and plasmon energy shifts on the order of 10(-2) meV.

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Citations

Mar 17, 2017·Nano Letters·Man-Nung SuStephan Link
Jan 5, 2019·Physical Review Letters·Rodrigo BerteAndrea V Bragas
Jul 29, 2017·Physical Review Letters·William M DeaconJeremy J Baumberg
Nov 30, 2018·Reports on Progress in Physics·Gary BeaneGregory V Hartland
Dec 2, 2017·Nano Letters·Matthew S KirschnerRichard D Schaller
Jan 13, 2021·Reports on Progress in Physics·Yabin JinMahmoud I Hussein

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