A polarization-insensitive tunable electromagnetically induced transparent terahertz device

An electromagnetically induced transparency and terahertz technology, which is applied to devices containing a node of different materials, superconductor components, etc., can solve the problem that the unit structure is difficult to achieve symmetry, does not have the function of group delay adjustment, and is easy to be limited And other issues
CN110246956BActive Publication Date: 2021-10-26NAT UNIV OF DEFENSE TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NAT UNIV OF DEFENSE TECH
Publication Date
2021-10-26

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Abstract

The invention belongs to the field of metamaterial structures, in particular to a polarization-insensitive tunable electromagnetically induced transparent terahertz device. The device is composed of a substrate, a graphene layer, a metal layer and a metal electrode; the substrate includes a silicon layer and a silicon dioxide layer covering the silicon layer; the graphene layer covers the upper surface of the silicon dioxide layer , and the graphene layer is composed of periodically arranged graphene frame structures; the metal layer covers the upper surface of the silicon dioxide layer, and the metal layer is composed of periodically arranged cross-shaped metal unit structures; One electrode of the metal electrode is arranged at the edge of the graphene layer and connected with the graphene layer, and the other electrode is arranged at the edge of the silicon layer and connected with the silicon layer. The invention can realize electromagnetically induced transparency and generate slow light effect. The invention can realize the regulation of the transmission characteristics and slow light effect of metamaterial devices by applying external bias voltage, and effectively adjust the size of the group delay.
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Description

technical field

[0001] The invention belongs to the field of metamaterial structures, and in particular relates to a polarization-insensitive adjustable electromagnetically induced transparent terahertz device. Background technique

[0002] Electromagnetically induced transparency is a coherent process in an atomic system. It refers to the interference of energy level transitions generated by an external light beam in an originally opaque material, making it transparent in a very narrow frequency band. window. This phenomenon is accompanied by strong dispersion and frequency selection, which can produce slow light effects and filtering characteristics. Using metamaterials to simulate electromagnetically induced transparency in atomic systems overcomes the harsh conditions required in atomic systems such as low temperature, optical pumping, and metal gas environments. Through structural design, electromagnetic waves can excite bound modes on the surface of metamaterials, re...

Claims

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