Realizing efficient THz circular dichroism using ultra-thin chiral metasurface

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Ubaid Ur Rahman Qureshi
  • M Ismail Khan
  • Bin Hu

Related Research Unit(s)

Detail(s)

Original languageEnglish
Article number075513
Journal / PublicationPhysica Scripta
Volume98
Issue number7
Online published26 Jun 2023
Publication statusPublished - Jul 2023

Abstract

Circular dichroism is characterized by distinct optical responses for left-handed and right-handed circularly polarized waves widely used for biological monitoring, analytical chemistry, and plasmonic sensing. This work proposes a chiral metasurface composed of a Mushroom-shaped (MS) pattern to achieve circular dichroism in reflection mode at THz frequencies. The maximum achieved absorption efficiency is 98.49% for the left-handed circularly polarized (LCP) incident wave. In comparison, the right-handed circularly polarized (RCP) incident wave is 7.39% at the resonant frequency of 12.4 THz. This high absorption results in remarkable circular dichroism (CD) of 91. 10%. Moreover, a stable response has been observed with the variation of incident angles from 0° to 30°. Meanwhile, power loss distribution, current distribution, and retrieved effective physical parameters have been used in analyzing the absorption mechanism. The high polarization selective absorption efficiency, angular stability, and compact size qualify the proposed design for a diverse range of THz applications. © 2023 IOP Publishing Ltd.

Research Area(s)

  • chiral metasurface, circular dichroism, left-handed circularly polarized (LCP), mushroom-shaped (MS) pattern, right-handed circularly polarized

Citation Format(s)

Realizing efficient THz circular dichroism using ultra-thin chiral metasurface. / Qureshi, Ubaid Ur Rahman; Khan, M Ismail; Hu, Bin.
In: Physica Scripta, Vol. 98, No. 7, 075513, 07.2023.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review