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Hugely tunable circular dichroism based on phase-change planar chiral metamaterials
Author(s): Shuai Ren; Youwen Liu; Daxing Dong; Junsheng Li; Shaoyong Peng; Kai Gao
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Paper 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.

Paper Details

Date Published: 15 November 2018
PDF: 10 pages
Proc. SPIE 10964, Tenth International Conference on Information Optics and Photonics, 109644D (15 November 2018); doi: 10.1117/12.2506089
Show Author Affiliations
Shuai Ren, Nanjing Univ. of Aeronautics and Astronautics (China)
Youwen Liu, Nanjing Univ. of Aeronautics and Astronautics (China)
Daxing Dong, Nanjing Univ. of Aeronautics and Astronautics (China)
Junsheng Li, Nanjing Univ. of Aeronautics and Astronautics (China)
Shaoyong Peng, Nanjing Univ. of Aeronautics and Astronautics (China)
Kai Gao, Nanjing Univ. of Aeronautics and Astronautics (China)


Published in SPIE Proceedings Vol. 10964:
Tenth International Conference on Information Optics and Photonics
Yue Yang, Editor(s)

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