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Liquid refractive index sensing system and method based on metal grating terahertz metasurface

A liquid refractive index and metal grating technology, applied in the field of terahertz liquid refractive index sensing, can solve the problems of incident terahertz wave energy attenuation, sensing detection, absorption, etc., to alleviate strong absorption, effective sensing and detection, and improve Effect of Sensitivity

Pending Publication Date: 2022-03-15
FUZHOU UNIV
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Problems solved by technology

Because when the detection sample has a high loss, such as water and other polar liquids, the incident terahertz wave energy will be severely attenuated or even completely absorbed, and effective refractive index sensing cannot be performed.

Method used

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  • Liquid refractive index sensing system and method based on metal grating terahertz metasurface
  • Liquid refractive index sensing system and method based on metal grating terahertz metasurface
  • Liquid refractive index sensing system and method based on metal grating terahertz metasurface

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Embodiment Construction

[0037] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0038] Please refer to figure 1 , the present invention provides a liquid refractive index sensing system based on a metal grating terahertz metasurface, including a metal grating terahertz metasurface 1, a liquid sample to be measured 2, a linear displacement platform 3, a terahertz emitter 4, an incident terahertz Pulse 5, high-resistance silicon prism 6, terahertz evanescent field 7, SPP wave 8, reflected terahertz pulse 9, terahertz detector 10, terahertz signal post-processing system 11.

[0039] In this embodiment, preferably, the metal grating terahertz metasurface 1 is processed by combining 3D printing technology and magnetron sputtering coating technology. Firstly, 3D printing technology is used to print to form a surface with a dimensional wavelength groove array structure. Preferably, the period of the groove structure unit is 60 μm, the wi...

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Abstract

The invention relates to a liquid refractive index sensing system based on a metal grating terahertz metasurface. The liquid refractive index sensing system comprises a high-resistance silicon prism coupling type metal grating terahertz metasurface sensing device and a post-processing system, wherein the high-resistance silicon prism coupling type metal grating terahertz metasurface sensing device is used for detecting the refractive index of liquid; and the post-processing system is used for visualizing and processing detected terahertz spectrum information in real time. According to the invention, a metal grating terahertz metasurface is used as a carrier, a high-momentum surface plasmon polariton (SPP) wave on the metal grating terahertz metasurface is excited through a high-resistance silicon prism coupler, and the sensing detection of the refractive index of a liquid sample to be detected in a groove in the surface of the metal grating is realized by using the extremely strong dielectric sensitivity of the SPP wave. Not only is the sensing sensitivity of the sensing system greatly improved, but also the strong absorption of the polar liquid to terahertz waves is relieved to the greatest extent, and effective sensing detection of the refractive index of a liquid sample is realized.

Description

technical field [0001] The invention belongs to the field of terahertz liquid refractive index sensing, and in particular relates to a liquid refractive index sensing system and method based on a metal grating terahertz metasurface. Background technique [0002] Metal microstructured terahertz metasurfaces can change the spatial distribution of terahertz waves during transmission and support the generation of surface plasmons, thereby realizing the subwavelength confinement of terahertz electromagnetic fields in metals and bringing about significant electric field enhancement effects. This important feature is very beneficial to enhance the interaction between terahertz waves and samples, and can perform qualitative or quantitative sensing detection on trace samples. Therefore, it is very suitable as a platform for terahertz sensing and detection. Due to the real-time, non-destructive, label-free and high-sensitivity detection characteristics of terahertz metasurface sensor...

Claims

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Application Information

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IPC IPC(8): G01N21/3586G01N21/41G01N21/01
CPCG01N21/3586G01N21/4133G01N21/01G01N2021/0112
Inventor 黄异钟宇杰钟舜聪林廷玲曾秋铭
Owner FUZHOU UNIV
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