Large language models in intelligent manufacturing and mechanical engineering: a review of robotics, fault diagnosis, design, and engineering knowledge workflows

Sherif Samy Sorour

doi:10.1007/s10845-026-02927-y

Terahertz chiral metasurface with tunable VO2 dual-frequency phase transition: anomalous reflection and near-field encryption

2026-04-01

0

PRE

AI

Y

YANG HONGYAN

Y

Yu, Fangzhou

Y

YANSHENG ZHUO

L

Li, Aiming

W

WENLONG ZHI

M

MINJIE ZHANG

X

Xiao, Gongli

DOI：10.1364/AO.593115

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Addressing the limitations of current chiral metasurfaces with narrow operational bandwidths and monotonous functionality, this paper proposes a dual-frequency phase-change tunable terahertz chiral metasurface device based on vanadium dioxide (VO2). This innovation achieves functions such as anomalous reflection and near-field densification. This design employs temperature-controlled regulation of VO2 conductivity to achieve strong circular dichroism (CD) responses of 0.81 and -0.82 at 3.17 and 3.87 THz, respectively. When arrayed, the metasurface generates approximately +/- 20 degrees chiral anomalous reflection at both operating frequencies and supports near-field encryption imaging based on its mirroring properties. This device holds significant application value in the fields of terahertz absorption, polarization conversion, and chiral imaging. (c) 2026 Optica Publishing Group. All rights, including for text and data mining (TDM), Artificial Intelligence (AI) training, and similar technologies, are reserved.

Keywords:

STRONG CIRCULAR-DICHROISM

BROAD-BAND

ABSORBER

METAMATERIAL

METAL

Terahertz chiral metasurface with tunable VO2 dual-frequency phase transition: anomalous reflection and near-field encryption

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