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Multi-band terahertz chiral metasurface with giant optical activities and negative refractive index based on T-shaped resonators

Hao Ran Chen

School of Information Science and Engineering, Wuhan University of Science and Technology, Wuhan, Hubei 430081, China

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Yong Zhi Cheng

School of Information Science and Engineering, Wuhan University of Science and Technology, Wuhan, Hubei 430081, China

E-mail Address: chengyz@wust.edu.cn; cyz0715@126.com

Corresponding author.

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Jing Cheng Zhao

School of Electronics and Information Engineering, Beihang University, Beijing 100191, China

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, and

Xue Song Mao

School of Information Science and Engineering, Wuhan University of Science and Technology, Wuhan, Hubei 430081, China

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https://doi.org/10.1142/S0217984918503669Cited by:12 (Source: Crossref)

Abstract

A novel chiral metasurface (CMS) based on T-shaped resonators is proposed and investigated numerically. The CMS is composed of a periodic array of bi-layered conjugated fourfold T-shaped structure. The retrieved effective electromagnetic (EM) parameters indicate that the multi-band negative refractive index associated with strong optical activity and circular dichroism (CD) effect is realized in terahertz (THz) region. The physical mechanism is illustrated by analyzing the current density distributions. Due to its exotic chiral optical properties, the proposed CMS is useful for the development of THz devices.

Keywords:

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