Active manipulation of Dirac semimetals supported chiral coding metasurfaces for multifunctional applications in terahertz region

Zhenkai Li; Chunyang Jiang; Kun Wang; Meng Liu; Chuanhao Li; Changdong Tian; Huiyun Zhang; Yuping Zhang

Results in Physics (Mar 2023)

Active manipulation of Dirac semimetals supported chiral coding metasurfaces for multifunctional applications in terahertz region

Zhenkai Li,
Chunyang Jiang,
Kun Wang,
Meng Liu,
Chuanhao Li,
Changdong Tian,
Huiyun Zhang,
Yuping Zhang

Affiliations

Zhenkai Li: Qingdao Key Laboratory of Terahertz Technology, College of Electronic and Information Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Chunyang Jiang: Qingdao Key Laboratory of Terahertz Technology, College of Electronic and Information Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Kun Wang: Qingdao Key Laboratory of Terahertz Technology, College of Electronic and Information Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Meng Liu: Qingdao Key Laboratory of Terahertz Technology, College of Electronic and Information Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Chuanhao Li: Qingdao Key Laboratory of Terahertz Technology, College of Electronic and Information Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Changdong Tian: Qingdao Key Laboratory of Terahertz Technology, College of Electronic and Information Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Huiyun Zhang: Qingdao Key Laboratory of Terahertz Technology, College of Electronic and Information Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Yuping Zhang: Corresponding author.; Qingdao Key Laboratory of Terahertz Technology, College of Electronic and Information Engineering, Shandong University of Science and Technology, Qingdao 266590, China

Journal volume & issue: Vol. 46
p. 106323

Abstract

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Multifunctional coding metasurfaces can provide more options for highly integrated terahertz modulators, which has become one of the current research focus. This study proposed a tunable chiral metasurface based on a Dirac semimetal (DSM). Two U-shaped rings placed perpendicular to each other in the opening direction comprised the metasurface unit cell. Further, the multifunctional application of the metasurface in the terahertz region was realized through coding. The chiral metasurface exhibited strong chirality for incident circularly polarized light with circular dichroism (CD) of up to 0.72 at 2.31 THz. The combination of the chiral metasurface with the Pancharatnam-Berry (PB) phase aided in the realization of a wideband switchable terahertz vortex beam generator, arbitrary angular deflection tuning of the vortex beam, and multi-beam splitting operation of the vortex light using a Fourier convolution operation. In addition, switchable near-field imaging applications were developed by encoding metasurface unit cell cells according to their chirality and amplitude. The results of this study are expected to yield promising applications in future terahertz high-data-capacity communication systems, multi-target information transmission, and controlled near-field imaging.

Published in Results in Physics

ISSN: 2211-3797 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Science: Physics
Website: http://www.journals.elsevier.com/results-in-physics/

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