Terahertz detector

A technology of terahertz detectors and dielectric intervals, which is applied in the field of terahertz detectors, can solve the problems of low integration of photodetectors, insufficient detection sensitivity, and low response rate, and achieve low power consumption, high integration, and high Effect on Response Rate
CN113540260APending Publication Date: 2021-10-22深圳网联光仪科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
深圳网联光仪科技有限公司
Publication Date
2021-10-22

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Abstract

The invention provides a terahertz detector. The terahertz detector comprises a substrate layer; a metal reflecting layer which is arranged on the substrate layer; a dielectric spacer layer which is arranged on the metal reflecting layer; a first Dirac semimetal layer and a second Dirac semimetal layer which are symmetrically arranged on the dielectric spacer layer; and a metal grating layer which is arranged on the dielectric spacer layer and is positioned between the first Dirac semimetal layer and the second Dirac semimetal layer. According to the terahertz detector, a composite structure of the anisotropic optical antenna and the Dirac semimetal layer is designed, and high polarization discrimination excitation and impedance matching coupling are based on the plasmon resonant cavity; incident light with the polarization direction perpendicular to the metal grating is efficiently converted into a sub-wavelength strong light field fully overlapped with the Dirac semimetal layer. According to the device, the light absorption and the light response of the Dirac semimetal layer are greatly improved, and the device has a higher polarization extinction ratio, a higher integration level, a higher response rate and lower power consumption.
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Description

technical field

[0001] The invention relates to the technical field of photodetectors, in particular to a terahertz detector. Background technique

[0002] The emergence of topological Dirac semimetals provides an ideal experimental regime for the discovery of new quasiparticles that are often elusive in high-energy physics, such as Dirac fermions, Weyl fermions, and other exotic new quantum state. The discovery of topological insulators and topological semimetals has drawn attention to fundamental excitations and nontrivial topological features in solid-state crystals, especially Weyl semimetals and Dirac semimetals, which can have Wide range of applications.

[0003] Studies have shown that materials belonging to the second class of topological Dirac semimetals will lead to some new quantum phenomena, such as field selectivity anomalies and chiral mode inversion and new mechanisms for entropy transport. A single Weyl point in a material has well-defined chirality, and i...

Claims

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