Theoretical study of tunable spin-selective terahertz perfect absorption via dual-magnetic-dipoles resonance in an l-shaped metasurface

IF 2.3 3区物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY

Physics Letters A Pub Date : 2025-03-19 DOI:10.1016/j.physleta.2025.130463

Ying-Hua Wang , Xin-Yue Sun , Hui Zheng , Xia Zhang , Shi-Tong Xu , Zheng-Gao Dong

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引用次数: 0

Abstract

Spin‐selective absorption metasurfaces for incident circularly polarized (CP) waves represent a significant research focus in optics. In this study, an L‐shaped metasurface is proposed that achieves perfect spin‐selective absorption in the terahertz (THz) band. Consequently, the absorption efficiencies for right‐handed and left‐handed CP waves attain values of up to 99.9 % and 99.5 % at 0.28 THz and 0.35 THz, respectively. Correspondingly, maximum circular dichroism values of 0.85 and.86 are observed at the two resonant frequencies. Furthermore, two graphene strips were deposited on the upper surface of the dielectric substrate, demonstrating that both spin‐selective absorption and circular dichroism can be flexibly tuned by altering the Fermi energy. The resulting metasurface, featuring tunable and spin‐selective perfect absorption properties, holds promise for applications in wireless communications, terahertz sensing, and imaging.

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来源期刊

Physics Letters A 物理-物理：综合

CiteScore

5.10

自引率

3.80%

发文量

493

审稿时长

30 days

期刊介绍： Physics Letters A offers an exciting publication outlet for novel and frontier physics. It encourages the submission of new research on: condensed matter physics, theoretical physics, nonlinear science, statistical physics, mathematical and computational physics, general and cross-disciplinary physics (including foundations), atomic, molecular and cluster physics, plasma and fluid physics, optical physics, biological physics and nanoscience. No articles on High Energy and Nuclear Physics are published in Physics Letters A. The journal''s high standard and wide dissemination ensures a broad readership amongst the physics community. Rapid publication times and flexible length restrictions give Physics Letters A the edge over other journals in the field.