Narrow-linewidth circular dichroism in asymmetric double split ring resonator metasurface

Liangkun Dai; Chengchen Bi; Lu Chen; Zhaomin Rong; Wu Fei; Xiangyun Jiang; Chan Huang; Jigang Hu

doi:10.1117/12.2686499

28 November 2023 Narrow-linewidth circular dichroism in asymmetric double split ring resonator metasurface

Liangkun Dai, Chengchen Bi, Lu Chen, Zhaomin Rong, Wu Fei, Xiangyun Jiang, Chan Huang, Jigang Hu

Proceedings Volume 12773, Nanophotonics and Micro/Nano Optics IX; 1277305 (2023) https://doi.org/10.1117/12.2686499
Event: SPIE/COS Photonics Asia, 2023, Beijing, China

Abstract

Strong and narrow-linewidth circular dichroism (CD) spectroscopy promises potential applications in bio-chemical sensing and detection of the weak chirality in natural molecules. Here we proposed a chiral metasurface formed by the asymmetric metal double split ring resonator (DSRR) arrays, the circular dichroism (CD) of which has been investigated. The maximum CD for absorption response of the metasurface can reach 0.61 with an ultra-narrow spectral linewidth of 9.6 nm in the mid-infrared (MIR) band. Our calculation results show that the chiral metasurface can support two surface lattice resonance modes for the left circularly polarized (LCP) and right circularly polarized (RCP) light. The narrow linewidth of CD is enabled by the spin-selective high-Q resonance modes with a differential absorptivity for LCP and RCP light. Our findings shed light on the potential applications in spin-selective perfect optical absorption, high-sensitive polarization detection, and chirality sensing.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Liangkun Dai, Chengchen Bi, Lu Chen, Zhaomin Rong, Wu Fei, Xiangyun Jiang, Chan Huang, and Jigang Hu "Narrow-linewidth circular dichroism in asymmetric double split ring resonator metasurface", Proc. SPIE 12773, Nanophotonics and Micro/Nano Optics IX, 1277305 (28 November 2023); https://doi.org/10.1117/12.2686499

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KEYWORDS

Polarized light

Absorption spectrum

Spectral response

Split ring resonators

Absorption

Light absorption

Aluminum

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