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A terahertz band metamaterial sensor

A metamaterial and terahertz technology, applied in the field of terahertz sensors, can solve the problems of limiting the application of terahertz sensors, affecting the sensing detection accuracy, and insufficient detection sensitivity, and achieving electromagnetically induced transparency effects, increasing refractive index sensitivity, The effect of high refractive index sensitivity

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
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  • A terahertz band metamaterial sensor

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Embodiment Construction

[0022] 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.

[0023] The technical scheme that the present invention solves the problems of the technologies described above is:

[0024] The terahertz band metamaterial sensor of the present invention such 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 plurality of structural units composed of resonant rings and metal strips, and each of the resonant ring units as a whole is A circular resonant ring, and four openings of the same size are provided in the obliquely symmetrical direction of the resonant ring. The metal strip is located in the resonant ring and is translated upward ...

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Abstract

The present invention claims a terahertz band metamaterial sensor. The sensor includes a dielectric layer and a subwavelength metal array metamaterial attached to the dielectric layer. The subwavelength metal array unit is composed of a circular resonant ring and a metal strip. The obliquely symmetrical direction of the circular resonant ring is provided with four openings of the same size. , the metal strip is located in the resonant ring and is translated upward by 1 μm relative to the center of the resonant ring, forming an asymmetric structure in the x direction. Through the introduction of structural asymmetry, the EIT-like effect is realized, and the Q value and sensing performance of the device are improved. The sensor measures the sensitivity of the sensor by the shift 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 highly sensitive refractive index sensing in the frequency range of 400GHz-900GHz.

Description

technical field [0001] The invention belongs to the terahertz sensor technology, in particular to a metamaterial high-Q and high-sensitivity refractive index sensor. Background technique [0002] Terahertz waves are between millimeter waves and infrared light, with frequencies in the range of 0.1THz to 10THz, and corresponding wavelengths in the range of 3mm to 30μm. At present, with the development of terahertz radiation generation and detection technology, THz has great potential in non-ionizing biochemical sensing applications. Subwavelength metallic structures (also known as metamaterials) refer to metallic structures whose structural size is much smaller than the wavelength, and have peculiar electromagnetic resonance properties, such as negative refraction, anomalous transmission, and sensitivity to dielectric environments, etc., and its properties do not mainly depend on It is not the intrinsic properties of the constituent materials, but its artificially designed st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/41G01N21/01
CPCG01N21/01G01N21/4133
Inventor 潘武闫彦君沈大俊
Owner CHONGQING UNIV OF POSTS & TELECOMM
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