Terahertz photoacoustic detection device and method

Abstract

The embodiment of the invention discloses a terahertz photoacoustic detection device and method. The terahertz photoacoustic detection device comprises a light source module, an ultrasonic detection module, a processing module and a temperature control module, the light source module is used for emitting a wavelength-tunable terahertz light beam, and the terahertz light beam enters a to-be-detected sample and forms a photoacoustic signal after passing through the to-be-detected sample; the temperature control module is used for adjusting the temperature of the to-be-tested sample; the ultrasonic detection module is used for detecting a photoacoustic signal and converting the photoacoustic signal into an electric signal; the processing module is connected with the ultrasonic detection module and is used for acquiring an absorption spectrum in the to-be-detected sample according to the electric signal, so that fusion of a terahertz technology and a photoacoustic technology is realized, terahertz characteristic absorption information of a target detection object in the to-be-detected sample is acquired, and further application of terahertz radiation in life science is expanded; and the device has the characteristics of simple structure, convenience in operation and low cost.

Description

technical field [0001] Embodiments of the present invention relate to the field of terahertz technology, and in particular to a terahertz photoacoustic detection device and method. Background technique [0002] Terahertz (THz) waves refer to electromagnetic waves with a frequency in the range of 0.1 THz to 10 THz, located between the microwave and infrared regions. Due to the advantages of low photon energy, rich absorption spectrum, and good penetration, terahertz beams have shown great potential in many important fields such as physics, chemistry, electronic information, life science, material science, communication radar, and national security. application prospects. [0003] The photon energy of terahertz radiation is very low (~meV level) and will not cause ionization damage. The terahertz spectrum of matter contains rich physical and chemical information. Studying the spectrum of matter in this band is of great significance for the exploration of material properties. ...

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Problems solved by technology

[0004] However, the existing terahertz biological detection uses terahertz reflectance spectroscopy and attenuated total reflectance spectroscopy, most of which require complex pretreatment of samples or direct detection of extremely thin (~200 μm) water-rich samples, which will make it difficult to obtain the inner surface of the sample. information, and the strong absorption signal of water tends to overwhelm the weak signal from target biomolecules, which greatly limits the further application of terahertz radiation in life sciences

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