Abstract

Ultrafast laser irradiation of single gold nanorods of various sizes is simulated for the investigation of the vibrations of the nanorods. The investigation uses a hybrid method that couples molecular dynamics (MD) with the two-temperature model (TTM). The extensional frequencies of the single gold nanorods are extracted from the atomic trajectories obtained by the MD simulations. In combination with continuum elasticity, the elastic moduli of the single gold nanorods are determined, along with the predicted extensional frequencies of the nanorods. It is shown that as the nanorod width increases, the modulus of the single gold nanorods also increases and approaches that of bulk gold. The notable softening of the elastic modulus is clearly shown for the smaller nanorods with widths of $\sim 8$ and $\sim 12\mathrm{nm}$.

© 2015 Optical Society of America

Crystal structure dependence of the breathing vibration of individual gold nanodisks induced by the ultrafast laser

Yong Gan and Zheng Sun
Appl. Opt. 58(1) 213-218 (2019)

Plasmon ruler with gold nanorod dimers: utilizing the second-order resonance

Maxim R. Shcherbakov, Anton T. Le, Natalia Dubrovina, Anatole Lupu, and Andrey A. Fedyanin
Opt. Lett. 40(7) 1571-1574 (2015)

Imaging and characterizing shear wave and shear modulus under orthogonal acoustic radiation force excitation using OCT Doppler variance method

Jiang Zhu, Yueqiao Qu, Teng Ma, Rui Li, Yongzhao Du, Shenghai Huang, K. Kirk Shung, Qifa Zhou, and Zhongping Chen
Opt. Lett. 40(9) 2099-2102 (2015)

Reshaping enhancement of gold nanorods by femtosecond double-pulse laser

Dezhi Zhu, Jianfeng Yan, and Jiawang Xie
Opt. Lett. 45(7) 1758-1761 (2020)

Characterizing gold nanorods in aqueous solution by acoustic vibrations probed with four-wave mixing

Jian Wu, Dao Xiang, and Reuven Gordon
Opt. Express 24(12) 12458-12465 (2016)