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Enhanced circular dichroism of plasmonic chiral system due to indirect coupling of two unaligned nanorods with metal film

Ying Li, Yu Bai, Ziyan Zhang, Abuduwaili Abudukelimu, Yaqi Ren, Ikram Muhammad, Qi Li, and Zhongyue Zhang

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Abstract

Circular dichroism (CD) demonstrates broad application prospects in enantioselective catalysis, chiral separation, and ultrasensitive detection. Increasing the CD intensity of easily fabricated plasmonic nanostructures will promote the application of these artificial nanostructures. A chiral plasmonic system that consists of two unaligned nanorods and a metal film is proposed in this study to achieve a large CD effect. Indirect coupling of a nanorod–film–nanorod in the proposed chiral plasmonic system generates a larger CD intensity compared to the direct coupling of a nanorod–nanorod. In addition, the effects of structural parameters on the CD effect of the proposed system are numerically investigated. Results showed that the indirect coupling is strongly dependent on the separation between the nanorod and the metal film. The results of this study can provide an effective strategy to enhance the CD effect of plasmonic chiral systems.

© 2021 Optical Society of America

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Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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