A programmable transreflective terahertz metasurface based on vanadium dioxide

By integrating vanadium dioxide phase change material into a metasurface and using external excitation to switch between reflection and transmission modes, the problem of the single function of existing metasurfaces is solved, and multi-mode, multi-degree-of-freedom dynamic control and high-quality holographic imaging effects are achieved.

CN122436715APending Publication Date: 2026-07-21CHINA UNIV OF MINING & TECH +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA UNIV OF MINING & TECH
Filing Date
2026-06-24
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

Existing tunable metasurfaces have limited functionality and are difficult to achieve dynamic control of transmission/reflection modes and multiple modes and degrees of freedom within the same structure.

Method used

Design a programmable terahertz metasurface based on vanadium dioxide. By integrating vanadium dioxide phase change material into the same metasurface structure, its phase change state can be controlled by external thermal or optical excitation to achieve switching between reflection and transmission modes. Furthermore, the transmission phase and geometric phase encoding can be achieved by adjusting the angle and rotation angle of the metal structure layer.

Benefits of technology

It achieves dynamic switching between reflection and transmission modes, expands the functional integration of metasurface devices, enables single-beam anomalous reflection and vortex beam deflection in reflection mode, and achieves high-quality holographic image reconstruction in transmission mode, significantly improving the freedom and functional diversity of beam manipulation.

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Abstract

The application provides a programmable transmissive and reflective terahertz metasurface based on vanadium dioxide, which comprises a plurality of metasurface units arranged in a periodic array, the metasurface unit comprises a first metal structure layer, a dielectric layer and a second metal structure layer stacked in sequence, the first metal structure layer comprises a first metal double-split ring and a first metal control element, the double-split ring is composed of two metal rings arranged coaxially and having symmetric notches, and the notches of the two rings are 90 degrees different; the control element is arranged in the notch of the inner ring and is in contact with the inner wall of the outer ring, the second metal structure layer comprises a second metal double-split ring and a second metal control element, and the phase change of vanadium dioxide is controlled through external heat or light excitation, so that the switching of the metasurface unit between the reflection mode and the transmission mode can be realized; in the reflection mode, the transmission phase coding is realized by adjusting the opening angle of the first metal ring and rotating the first metal structure layer; and in the transmission mode, the geometric phase coding is realized by synchronously rotating the angles of the first metal structure layer and the second metal double-split ring.
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