Mr. Wei Pan Profile

Wei Pan

at Beijing Univ of Posts and Telecommunications

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Proceedings Article | 28 November 2023 Poster + Paper

Enhancement of intrinsic chirality based on asymmetric metasurface

Ziang Gao, Wei Pan, Tonggang Zhao

Proceedings Volume 12773, 1277315 (2023) https://doi.org/10.1117/12.2687145

KEYWORDS: Electromagnetism, Polarized light, Near field optics, Dichroic materials, Refractive index, Chiral materials, Silicon, Optical properties, Nanostructures, Design and modelling

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Chirality is a common phenomenon in nature, mainly manifested in the symmetry of matter, which means that matter and its mirror image cannot overlap through rotation or translation. Chirality has significant research and application value in the field of optics. Circularly polarized light itself has chirality, that is, left-handed circularly polarized (LCP) light and right-handed circularly polarized (RCP) light. When a chiral circularly polarized light interacts with different chiral optical metasurface, it will show different optical properties. As a result, the chiral electromagnetic response can be adjusted through the construction of an optical metasurface through material choice and structural design, and the strong chiral field limited near the structure of chiral metasurface can also enhance the circular dichroism (CD) signal of the chiral molecules located therein, which has important application value in the fields of optical chiral sensing, chiral particle separation, and chiral regulation. Here, we calculate the CD value using the transmission spectra of LCP and RCP incident light. In this paper, we present the design of an innovative chiral metasurface predicated upon silicon nanostructures, which incorporates two distinct open-ring resonators. Through meticulous parameter optimization, we attain a maximum CD value of 0.94432 upon exciting the metasurface's inherent chirality. Furthermore, we employ the electromagnetic multipole decomposition technique to elucidate the preeminent electromagnetic modes. This study holds paramount significance in advancing our comprehension of optical-matter interactions and in augmenting our chiral sensing capabilities. Subsequent to an exhaustive analysis of the sensing characteristics, the calculated sensitivity is determined to be 287 nm/RIU.

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