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

•Multifunctional applications of metasurface in terahertz region via coding.•Extended application of coding metasurface in near-field imaging.•Switchable terahertz vortex beam generator was realized.•Arbitrary angle deflection and multi-beam splitting of the vortex beam. Multifunctional coding metas...

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Bibliographic Details
Published in:Results in physics 2023-03, Vol.46, p.106323, Article 106323
Main Authors: Li, Zhenkai, Jiang, Chunyang, Wang, Kun, Liu, Meng, Li, Chuanhao, Tian, Changdong, Zhang, Huiyun, Zhang, Yuping
Format: Article
Language:English
Subjects:
Coding metasurface
Dirac semimetals
Multifunction
Terahertz
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Summary:•Multifunctional applications of metasurface in terahertz region via coding.•Extended application of coding metasurface in near-field imaging.•Switchable terahertz vortex beam generator was realized.•Arbitrary angle deflection and multi-beam splitting of the vortex beam. 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.
ISSN:2211-3797
2211-3797
DOI:10.1016/j.rinp.2023.106323