A method and device for infrared spectrum enhancement and detection based on graphene nano-antenna

Abstract

The invention relates to an infrared spectrum enhancement and detection method and an infrared spectrum enhancement and detection device based on a graphene nano antenna. The device comprises a light source, a collimating lens, a one-point detector and an MEMS (micro-electromechanical system) grating light modulator based on the three-dimensional graphene nano antenna. Infrared light emitted from the light source is irradiated to the MEMS grating light modulator based on the three-dimensional graphene nano antenna through the collimating lens, an interference signal of the MEMS grating light modulator can be detected by the one-point detector, a detection signal is demodulated through Fourier transform, a spectrum is reproduced, and trace molecules are detected according to obtained spectrum information; the device has the advantages of good stability, high response speed, high sensitivity, dynamic tunable broadband, high enhancement factor and the like, can be expected to greatly increase the variety of substances detected by an infrared spectroscopic analysis technology and improve the detection sensitivity of the infrared spectroscopic analysis technology, and has a huge development space and a wide application prospect.

Description

technical field [0001] The invention relates to the technical field of infrared spectroscopy, in particular to a method and a device for expanding the detection band of a surface-enhanced infrared absorption spectrum and improving detection sensitivity. Background technique [0002] Infrared spectroscopy is a technology and method that directly detects changes in molecular vibration modes to reveal molecular vibration mechanisms and functions, and realizes feature recognition and quantitative analysis of substances. This technology has the advantages of high "fingerprint" characteristics, no need for sample labeling, fast response speed, the highest instrument penetration rate, and the most complete spectral library, etc. It is a powerful tool and an indispensable means to determine molecular composition, conformation and structural change information , Has been widely used in environmental monitoring, food safety testing, chemical composition analysis, explosives detection ...

AI Technical Summary

Problems solved by technology

Once the structural parameters of the enhanced substrate are fixed, the enhancement of the infrared absorption spectrum is also fixed, and the maximum absorption peak wavelength cannot be adjusted

Therefore, the processed enhanced substrate can only achieve spectral enhancement for the infrared narrow band corresponding to the structure, and cannot achieve infrared wide band spectral enhancement.

This allows the method to detect only a single molecular vibrational mode or a single substance

Although one resonance peak can be changed into several resonance peaks through structural design, it is limited by the nanofabrication process

The enhancement band of this method is still very narrow, and cannot break through the limitation of the dispersion characteristics of metal materials.

For unknown samples, its detection ability is greatly limited, and it is impossible to build a general platform for multi-type molecular detection, which does not have the universal significance of trace molecular detection

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