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Terahertz waveband metamaterial sensor

A metamaterial and sensor technology, applied in the field of terahertz sensors, can solve the problems of limiting the application of terahertz sensors, insufficient detection sensitivity, affecting the detection accuracy of sensing, etc., to achieve increased refractive index sensitivity, high refractive index sensitivity, outstanding The effect of usability features

Active Publication Date: 2018-08-17
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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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 invention provides a terahertz waveband metamaterial sensor, which comprises a dielectric layer and a sub-wavelength metal array metamaterial attached to the dielectric layer. A sub-wavelength metal array unit comprises circular resonance rings and metal strips, each circular resonance ring is provided with four openings identical in size in a skew-symmetric direction, and each metal strip ispositioned in the corresponding resonance ring and translated upwards by 1micron relative to the center of the corresponding resonance ring to form an asymmetric structure in the x direction. By introduction of the asymmetric structures, an EIT-like effect is realized, and a Q value and sensing properties of the sensor are improved. Sensitivity of the sensor is measured by translation quantity, inunit refractive index variation, of sharp transmission peak frequency generated by the EIT-like effect in a transmission spectrum, and high-sensitivity refractive index sensing in a frequency range of 400GHz-900GHz is realized.

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...

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Application Information

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Patent Type & Authority Applications(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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