Rapidly established terahertz attenuation total reflection system based on Dove prism

Abstract

The invention discloses a rapidly established terahertz attenuation total reflection system based on Dove prism, and belongs to the technical field of optical tests. The system comprises the following components arranged in sequence: a femtosecond laser, a beam splitter, a terahertz generator, a prism, a terahertz receiver and a signal processing system. The prism is a dove prism, whose axial section is in an isosceles trapezoid shape. The dove prism is made of a silicon material with high resistance and a high refractive index, and a reflector is arranged between the beam splitter and the terahertz receiver. By adopting a dove prism with an isosceles trapezoidal axial section, an attenuation total reflection system for detecting the terahertz spectrum of a sample can be established rapidly by parallelly arranging the prism in the optical path, the prism is not needed to be braced by a prism support, the overall optical path is not needed to be adjusted, the establishing time and material consumption are greatly reduced, at the same time, the prism surface can completely cover evanescent waves, the using amount of tested sample is obviously reduced, and thus the using cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of optical testing, and in particular relates to a terahertz attenuated total reflection system rapidly constructed based on a Dove prism. Background technique [0002] Terahertz (Terahertz, THz) wave refers to electromagnetic radiation with a frequency band between microwave and infrared, and the frequency is between 0.1THz-10THz (1THz=10 12 Hz), the wavelength is between 30μm-3000μm. Compared with microwaves, terahertz wavelengths and pulses are shorter and have higher temporal and spatial resolution. At the same time, its photon energy is small (the photon energy at 1THz is about 4meV), which will not cause damage to the material, which is safer than X-ray. In particular, the low-frequency vibration modes such as skeletal vibration, configuration bending, and rotation of biomolecules are in the terahertz energy range. The terahertz spectrum contains abundant physical and chemical information of biologic...

AI Technical Summary

Problems solved by technology

On the one hand, it is necessary to purchase a special prism bracket to transform the parallel incident light in the transmission mode of the terahertz spectrometer to the oblique incident light at a certain angle. The overall optical path needs to be adjusted, and the purpose of conveniently building an attenuated total reflection system cannot be achieved.

On the other hand, irregular polygonal prisms are relatively large in size, which consumes more materials. The evanescent waves on the surface of the prism are limited to some areas. When applied to the detection and analysis of different biomolecular (protein, nucleic acid) solutions, the amount of invalid samples is relatively large. More, especially easy to cause waste of relatively rare and low-abundance biomacromolecule solutions

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