Terahertz band metamaterial sensor based on quasi-electromagnetically induced transparency (quasi-EIT) effect

A technology that induces transparency and metamaterials, applied in the field of terahertz sensors, can solve the problems of limiting the application of terahertz sensors, insufficient detection sensitivity, and affecting the detection accuracy of sensors, and achieves increased refractive index sensitivity, high refractive index sensitivity, Highlight the effect of practical features

Active Publication Date: 2018-09-25
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...

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  • Terahertz band metamaterial sensor based on quasi-electromagnetically induced transparency (quasi-EIT) effect
  • Terahertz band metamaterial sensor based on quasi-electromagnetically induced transparency (quasi-EIT) effect
  • Terahertz band metamaterial sensor based on quasi-electromagnetically induced transparency (quasi-EIT) effect

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[0020] The technical solutions in the embodiments of the present invention will be described clearly and in detail below with reference to the 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 value, while t...

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Abstract

The invention claims a terahertz band metamaterial sensor based on quasi-electromagnetically induced transparency (quasi-EIT) effect. The terahertz band metamaterial sensor comprises a dielectric layer and a metamaterial of a sub-wavelength metal array on the dielectric layer, wherein the sub-wavelength metal array is composed of a plurality of open circular resonant rings and open square resonantrings. Under the excitation of terahertz waves, the open circular resonant rings and the open square resonant rings separately exhibit a bright mode and a dark mode; when the two resonant rings are combined and the space between the two is 80.0-85.0 micrometers, the bright and dark modes are coupled to each other, destructive interference is generated, realizing the quasi-EIT effect is realized,and sharp transmission peaks are produced near resonance points. The sensitivity of the terahertz band metamaterial sensor is measured according to the amount of translation of the frequency of the sharp transmission peaks generated by the quasi-EIT effect in the transmittance spectrum within the unit refractive index change, so as to realize the refractive index sensing function in the frequencyrange of 400 GHz to 800 GHz.

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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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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