Metal super lens structure for wavefront regulation and control of terahertz wave band

By designing a three-layer metal superlens structure and utilizing orthogonal metal grating layers and a metal unit array with variable geometric parameters, the ohmic loss problem in the terahertz band was solved, achieving efficient and super-resolution terahertz wave focusing and control, which is suitable for terahertz imaging, sensing and communication systems.

CN122172358APending Publication Date: 2026-06-09HUAZHONG UNIV OF SCI & TECH
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Patent Information

Application Number
CN202610365318.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-24
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Existing metal structures suffer from ohmic loss in the terahertz band, resulting in reduced transmission efficiency and making it difficult to achieve efficient focusing in compact and planar structures.

Method used

Design a metal superlens comprising a dielectric substrate and a three-layer metal metasurface structure, wherein the first metal grating layer and the second metal grating layer are orthogonal, and the geometric parameters of the metal units in the metal pattern layer vary with position to form an integrated resonant system that synergistically modulates the polarization and phase of terahertz waves.

Benefits of technology

It achieves tight focusing that breaks the diffraction limit at the target frequency, improves the signal-to-noise ratio and control efficiency of the focused spot, suppresses stray waves of undesigned polarization components, and has super-resolution capability and good manufacturing consistency.

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Abstract

The invention discloses a metal super lens structure used for terahertz wave band wavefront regulation and control, and belongs to the technical field of optical device manufacturing, a first metal grating layer and a second metal grating layer form a polarization selection structure, and the polarization selection structure is used for carrying out polarization screening on incident terahertz waves; precise phase regulation and control are carried out on transmission terahertz waves through the metal unit array, and efficient wavefront shaping is achieved. Through the cooperative resonance design among the multiple layers of metal metasurfaces, the overall regulation and control efficiency and stability of the device are improved while the planarization and compactness of the structure are ensured. By introducing a polarization selection structure, the terahertz wave component of non-design polarization is effectively suppressed, the background noise of a focusing plane is reduced, and the signal-to-noise ratio of a focusing light spot is improved; under the synergistic effect of the three-layer structure, the metal super lens can effectively focus incident terahertz waves under the target terahertz working frequency, so that the size of a focusing light spot is smaller than the diffraction limit under the corresponding frequency, and the super-resolution focusing effect is achieved.
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