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

Cun He; Jingpei Hu; Ti Sun; Junjie Guo; Jie Xia; Meng Cao; Chinhua Wang

doi:10.1117/12.2532721

17 May 2019 Enhanced circular dichroism by all-dielectric multi-size combined chiral structure

Cun He, Jingpei Hu, Ti Sun, Junjie Guo, Jie Xia, Meng Cao, Chinhua Wang

Proceedings Volume 11170, 14th National Conference on Laser Technology and Optoelectronics (LTO 2019); 1117016 (2019) https://doi.org/10.1117/12.2532721
Event: Fourteenth National Conference on Laser Technology and Optoelectronics, 2019, Shanghai, China

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 = T_RCP-T_LCP) reaches 97%, and the extinction ratio (ER = T_RCP/T_LCP) 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.

Citation Download Citation

Cun He, Jingpei Hu, Ti Sun, Junjie Guo, Jie Xia, Meng Cao, and Chinhua Wang "Enhanced circular dichroism by all-dielectric multi-size combined chiral structure", Proc. SPIE 11170, 14th National Conference on Laser Technology and Optoelectronics (LTO 2019), 1117016 (17 May 2019); https://doi.org/10.1117/12.2532721

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