Terahertz photoacoustic single-pixel imaging device and imaging method

Abstract

The invention discloses a terahertz photoacoustic single-pixel imaging device and an imaging method. The imaging device comprises a light source module, a spatial light modulation module, a terahertz light modulation module, a terahertz photoacoustic detection module and a processing module, wherein the light source module is used for outputting a pump laser beam and a terahertz beam; the spatial light modulation module is used for modulating the pumping laser beam and then transmitting the modulated pumping laser beam to the terahertz light modulation module; the terahertz light modulation module is used for modulating the terahertz light beam and then transmitting the modulated terahertz light beam to a to-be-imaged object; the terahertz photoacoustic detection module comprises a terahertz photoacoustic material and an ultrasonic detector, the terahertz photoacoustic material is used for generating a photoacoustic signal under the excitation of terahertz light, and the ultrasonic detector is used for converting the photoacoustic signal into an electric signal; and the processing module is used for realizing single-pixel imaging of the to-be-imaged object according to the electric signal. The device has advantages of low cost, convenience in use, high time resolution and spatial resolution and the like, and can be used for near-field terahertz imaging of an object to be imaged.

Description

technical field [0001] Embodiments of the present invention relate to terahertz imaging technology, and in particular to a terahertz photoacoustic single-pixel imaging device and an imaging method. Background technique [0002] The frequency of terahertz light is in the range of 0.1THz to 10THz, which is between millimeter wave and infrared wave. Due to the advantages of low photon energy, rich absorption spectrum, and good penetration, terahertz light has been widely used in security inspection, metamaterials, biomedicine, semiconductors, food and medicine in recent years. [0003] Among them, the fields involved in terahertz imaging include security inspection based on structural detection, biological detection based on molecular spectroscopy and other research. Because terahertz has lower photon energies, its detection is harmless compared to x-rays. However, there are some problems in terahertz imaging: first, the cost of terahertz imaging detectors is relatively high,...

AI Technical Summary

Problems solved by technology

However, there are some problems in terahertz imaging: first, the cost of terahertz imaging detectors is relatively high, and commonly used terahertz imaging detectors are expensive, up to hundreds of thousands; second, due to the long wavelength of terahertz, terahertz Far-field imaging resolution is limited by the diffraction limit, making it difficult to improve

However, there are still disadvantages such as high cost and resolution to be improved.

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