Hugely tunable circular dichroism based on phase-change planar chiral metamaterials

Shuai Ren; Youwen Liu; Daxing Dong; Junsheng Li; Shaoyong Peng; Kai Gao

doi:10.1117/12.2506089

15 November 2018 Hugely tunable circular dichroism based on phase-change planar chiral metamaterials

Shuai Ren, Youwen Liu, Daxing Dong, Junsheng Li, Shaoyong Peng, Kai Gao

Proceedings Volume 10964, Tenth International Conference on Information Optics and Photonics; 109644D (2018) https://doi.org/10.1117/12.2506089
Event: Tenth International Conference on Information Optics and Photonics (CIOP 2018), 2018, Beijing, China

Abstract

Circular dichroism (CD), different absorption of RCP and LCP waves, can be strongly enhanced in chiral metamaterials. CD spectrum is very meaningful feature in both biology and chemistry to probe the conformational state. In this paper, planar chiral metamaterials (PCM) comprising of a tri-layer metal/phase-change material (VO₂) /metal sandwich and conjugated gammadions are both studied theoretically by using finite-difference time-domain (FDTD) method. And a wide tuning range of CD is obtained by changing temperature of VO₂. Particle swarm optimization (PSO) algorithm is used to optimize the geometric parameters of PCM structures. A large value of circular dichroism in excess of 40% is presented in dielectric PCM, but CD drop down to 16% in the metallic PCM at λ=1.18μm. We also analyze the distribution of current modes, electric and magnetic fields at the resonant frequency to account for the above results.

Citation Download Citation

Shuai Ren, Youwen Liu, Daxing Dong, Junsheng Li, Shaoyong Peng, and Kai Gao "Hugely tunable circular dichroism based on phase-change planar chiral metamaterials", Proc. SPIE 10964, Tenth International Conference on Information Optics and Photonics, 109644D (15 November 2018); https://doi.org/10.1117/12.2506089

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KEYWORDS

Dielectrics

Absorption

Metals

Chiral metamaterials

Dichroic materials

Metamaterials

Optical activity

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