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Proceedings Paper

Enhanced circular dichroism by all-dielectric multi-size combined chiral structure
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Paper Abstract

We propose and present a high-efficiency circular dichroism device formed by an array of multi-size chiral slits etched in a silicon layer that is on a silicon dioxide substrate. Numerical results show that the all-dielectric chiral metasurface exhibits a high circular dichroism in the range of 1500-1550 nm. At the resonance wavelength of 1540 nm, the highest circular dichroism (CD = TRCP-TLCP) reaches 97%, and the extinction ratio (ER = TRCP/TLCP) is up to 1999:1. It is also found that multiple wavebands operation can be implemented by manipulating the relative positions of multi-size slits in the structure. The proposed 2D all-dielectric chiral metasurface has the advantages of high circular dichroism, easy-fabrication and high compatibility with linear polarized components, which provides a solution for pixelated full-Stokes polarization imaging.

Paper Details

Date Published: 17 May 2019
PDF: 7 pages
Proc. SPIE 11170, 14th National Conference on Laser Technology and Optoelectronics (LTO 2019), 1117016 (17 May 2019); doi: 10.1117/12.2532721
Show Author Affiliations
Cun He, Soochow Univ. (China)
Jingpei Hu, Soochow Univ. (China)
Ti Sun, Soochow Univ. (China)
Junjie Guo, Soochow Univ. (China)
Jie Xia, Soochow Univ. (China)
Meng Cao, Soochow Univ. (China)
Chinhua Wang, Soochow Univ. (China)

Published in SPIE Proceedings Vol. 11170:
14th National Conference on Laser Technology and Optoelectronics (LTO 2019)
Jianqiang Zhu; Weibiao Chen; Zhenxi Zhang; Minlin Zhong; Pu Wang; Jianrong Qiu, Editor(s)

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