A Terahertz Band Metamaterial Sensor Based on Electromagnetic-Induced Transparency Effect

A technology that induces transparency and metamaterials, applied in the field of terahertz sensors, can solve problems such as low spectral resolution, limiting the application of terahertz sensors, and affecting the accuracy of sensing detection

Active Publication Date: 2021-07-13
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0005] At present, the detection sensitivity of terahertz metamaterial refractive index sensors at home and abroad is not high enough for some trace substances or substances with small concentrations, which limits the application of terahertz sensors.
Moreover, the spectral resolution of the terahertz time-domain spectroscopy system currently used for experimental measurement is low, which affects the accuracy of sensing detection

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  • A Terahertz Band Metamaterial Sensor Based on Electromagnetic-Induced Transparency Effect
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  • A Terahertz Band Metamaterial Sensor Based on Electromagnetic-Induced Transparency Effect

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Embodiment Construction

[0020] The technical solutions in the embodiments of the present invention will be described clearly and in detail below in conjunction with the accompanying drawings in the embodiments of the present invention. The described embodiments are only some of the embodiments of the invention.

[0021] The technical scheme that the present invention solves the problems of the technologies described above is:

[0022] The terahertz wave refractive index sensor of the present invention is as figure 1 As shown, the sensor includes a dielectric layer and a metamaterial of a sub-wavelength metal array attached to the dielectric layer. The sub-wavelength metal array includes a structural unit composed of a plurality of split resonant rings, and each resonant ring unit is a circular opening as a whole A combined structure of a resonant ring and a square split resonant ring. Under the excitation of terahertz waves, the split circular resonant ring behaves as a "bright" mode with a large Q...

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Abstract

The present invention claims a terahertz band metamaterial sensor based on the electromagnetically induced transparency effect. The sensor includes a dielectric layer and a metamaterial of a subwavelength metal array on the medium layer, and the subwavelength metal array is composed of a plurality of split circular resonant rings and split square resonant rings. Under the excitation of terahertz waves, the single open circular resonant ring and the open square resonant ring behave as "bright" mode and "dark mode" respectively; Mutual coupling produces destructive interference, which realizes the EIT-like effect and produces a sharp transmission peak near the resonance point. The sensor measures the sensitivity of the sensor by the translation of the sharp transmission peak frequency produced by the EIT-like effect in the transmittance spectrum within a unit change in the refractive index, and realizes the refractive index sensing function in the frequency range of 400GHz-800GHz.

Description

technical field [0001] The invention belongs to the technical field of terahertz sensors, in particular to a refractive index sensor based on a metamaterial with an electromagnetically induced transparency effect. Background technique [0002] Terahertz (THz) radiation usually refers to electromagnetic radiation with a frequency between microwave and infrared bands. It is a special area on the electromagnetic spectrum transitioning from electronics to photonics, and its frequency ranges from 0.1 to 10 THz. At present, with the development of terahertz radiation generation and detection technology, THz has great potential in non-ionizing biochemical sensing applications. Metamaterials usually refer to artificial composite structures or composite materials with strange electromagnetic properties that natural media do not have in nature. They have peculiar electromagnetic resonance properties, such as negative refraction, abnormal transmission, and sensitivity to dielectric env...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/45
CPCG01N21/45
Inventor 潘武闫彦君沈大俊
Owner CHONGQING UNIV OF POSTS & TELECOMM
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