Enhanced circular dichroism of plasmonic system in the strong coupling regime

doi:10.1088/1674-1056/abd6fd

Abstract The circular dichroism (CD) signal of a molecule is usually weak, however, a strong CD signal in optical spectrum is desirable because of its wide range of applications in biosensing, chiral photo detection, and chiral catalysis. In this work, we show that a strong chiral response can be obtained in a hybridized system consisting of an artificial chiral molecule and a nanorod in the strong coupling regime. The artificial chiral molecule is composed of six quantum dots in a helix assembly, and its CD signal arises from internal Coulomb interactions between quantum dots. The CD signal of the hybridized system is highly dependent on the Coulomb interactions and the strong coupling progress through the electromagnetic interactions. We use the coupled oscillator model to analyze strong coupling phenomenon and address that the strong coupling progress can amplify the CD signal. This work provides a scenario for designing new plasmonic nanostructures with a strong chiral optical response.

Keywords: plasmonic chirality strong coupling circular dichroism

Received: 20 October 2020
Revised: 01 December 2020
Accepted manuscript online: 28 December 2020

PACS:	73.20.Mf	(Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))
	11.15.Me	(Strong-coupling expansions)
	71.36.+c	(Polaritons (including photon-phonon and photon-magnon interactions))

Fund: Project supported by the National Key R&D Program of China (Grant No. 2016YFA0301300), the Fundamental Research Funds for the Central Universities, China (Grant No. 2019XD-A09), and the National Natural Science Foundation of China (Grant No. 11574035).

Corresponding Authors: ^†Corresponding author. E-mail: yuliyuli@bupt.edu.cn

Cite this article:

Yun-Fei Zou(邹云飞) and Li Yu(于丽) Enhanced circular dichroism of plasmonic system in the strong coupling regime 2021 Chin. Phys. B 30 047304

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