Temperature-controlled terahertz chirality and imaging in a nested split-rings metasurface

IF 3.5 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2025-03-24 DOI:10.1063/5.0250905

Yu Tang, Junjie Li, Yang Cheng, Zhengqi Liu, Xiaoshan Liu, Guolan Fu, Hanyang Gong, Pingping Pan, Guiqiang Liu

引用次数: 0

Abstract

Chiral metasurfaces exhibit vast application prospects in near-field imaging, polarization conversion, and chiral sensing. In this work, we theoretically propose a temperature-tunable terahertz (THz) chiral absorber based on a metasurface of Ag–VO2 nested split-rings. Perfect absorption of left-handed circularly polarized light (LCP) exceeding 99% and weak absorption of only about 6% of right-handed circularly polarized light (RCP) are achieved at 7.24 THz in frequency. The discrepancy in absorption responses of LCP and RCP results in a large circular dichroism (CD) of 0.94. The CD value in the THz region can be actively modulated between 0.02 and 0.94 by controlling the phase transition of VO2, which is closely related to the ambient temperature. Moreover, near-field imaging and encrypted presentation are realized by leveraging the metasurface and its mirror-image properties. Our work holds significant promise in widespread fields including THz intelligent absorption, imaging, and chiral detection.

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来源期刊

Applied Physics Letters 物理-物理：应用

CiteScore

6.40

自引率

10.00%

发文量

1821

审稿时长

1.6 months

期刊介绍： Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology. In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics. APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field. Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.