MIM构型手性吸收超表面、验证方法及调控方法

By using a chiral absorbing metasurface with a MIM configuration, and through simulation verification of the metal-insulator transition of VO2 patches and the Drude model, the problems of functional dispersion and insufficient modulation efficiency of existing VO2 metasurfaces are solved, realizing efficient terahertz chiral absorption and beam modulation, which is suitable for terahertz reconfigurable imaging and integrated photonic systems.

CN121726760BActive Publication Date: 2026-07-17CHENGDU UNIV OF INFORMATION TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHENGDU UNIV OF INFORMATION TECH
Filing Date
2026-01-14
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing VO2-based tunable terahertz chiral metasurfaces suffer from problems such as functional dispersion, insufficient efficiency of single chiral modulation, and dependence on additional external parameters in the modulation process, making it difficult to meet the application requirements of terahertz reconfigurable imaging, unidirectional communication, and integrated photonic systems.

Method used

A chiral absorbing metasurface with a MIM configuration is used. By stacking a top chiral pattern layer, a dielectric layer and a gold substrate from top to bottom, the circular dichroism is continuously tuned from 0.06 to 0.95 using the metal-insulator transition of a rectangular VO2 patch. The simulation is verified by combining the Drude model and Jones matrix, realizing the integration of absorption-type CD tuning and reflection-type beamforming functions.

Benefits of technology

It achieves excellent chiral absorption tuning performance, precise chiral selective beam control, strong structural practicality, and high matching degree between simulation and actual scenarios, adapting to specific terahertz band application scenarios and meeting the needs of terahertz reconfigurable imaging, one-way communication and integrated photonic systems.

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Abstract

本发明公开了MIM构型手性吸收超表面、验证方法及调控方法，属于超表面领域，包括自上而下依次堆叠的顶部手性图案层、介质层和金基底，形成MIM构型；其中，顶部手性图案层为周期性阵列排布的手性单元，每个手性单元由1条矩形金属条、2个关于矩形金属条中心对称设置的四分之一圆弧及1个矩形VO2贴片构成，通过温度驱动矩形VO2贴片发生金属‑绝缘体转变，实现圆二色性连续调谐，同时达成吸收式CD调谐与反射式波束整形的功能集成。采用上述MIM构型手性吸收超表面、验证方法及调控方法，基于VO2相变特性与MIM构型手性超表面的结合，在太赫兹频段实现了高对比度可调谐手性吸收与手性选择性波束调控的协同集成。
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Citation Information

Patent Citations

  • VO2-based polarization modulator, polarization characteristic analysis method and modulation method

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