Second-harmonic optical circular dichroism of plasmonic chiral helicoid-III nanoparticles
Abstract
While plasmonic particles can provide optical resonances in a wide spectral range from the lower visible up to the near-infrared, often symmetry effects are utilized to obtain particular optical responses. By breaking certain spatial symmetries, chiral structures arise and provide robust chiroptical responses to these plasmonic resonances. Here, we observe strong chiroptical responses in the linear and nonlinear optical regime for chiral L-handed helicoid III nanoparticles and quantify them by means of an asymmetric factor, the so-called g-factor. We calculate the linear-optical g-factors for two distinct chiroptical resonances to -0.12 and -0.43 and the nonlinear optical g-factors to -1.45 and -1.63. The results demonstrate that the chirality of the helicoid-III nanoparticles is strongly enhanced in the nonlinear regime.
Keywords
Cite
@article{arxiv.2202.13594,
title = {Second-harmonic optical circular dichroism of plasmonic chiral helicoid-III nanoparticles},
author = {Florian Spreyer and Jungho Mun and Hyeohn Kim and Ryeong Myeong Kim and Ki Tae Nam and Junsuk Rho and Thomas Zentgraf},
journal= {arXiv preprint arXiv:2202.13594},
year = {2022}
}