Terahertz Raman Measurements Using a Spatial Heterodyne Raman Spectrometer

We propose a method of measuring the terahertz (THz) Raman spectra of a material. As Raman spectroscopy is a measurement of the relative frequency spectrum relative to the frequency of the excitation source, sometimes it is not necessary to use an expensive THz source and THz detector. Instead, an u...

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Bibliographic Details
Published inApplied sciences Vol. 11; no. 17; p. 8094
Main Authors Sun, Yuqi, Li, Xiaotian, Galantu, Jiri, Chu, Qihang, Chen, Jun, Liu, Zhongkai, Mi, Xiaotao, Yao, Xuefeng, Li, Pan
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.09.2021
Subjects
Aqueous solutions
Calibration
Environmental protection
Excitation
Field of view
Frequency spectrum
Lasers
Light
Measurement methods
Prisms
Raman spectra
Raman spectroscopy
Sensors
spatial heterodyne spectrometer
spectral detection
Spectrum analysis
Sulfur
Terahertz frequencies
terahertz Raman
Ultraviolet detectors
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Summary:We propose a method of measuring the terahertz (THz) Raman spectra of a material. As Raman spectroscopy is a measurement of the relative frequency spectrum relative to the frequency of the excitation source, sometimes it is not necessary to use an expensive THz source and THz detector. Instead, an ultraviolet, visible, or infrared excitation source and corresponding detector can be used. A combination of prisms and gratings is used to widen the field of view at high resolution. The resolution of the system is 4.945 cm−1 (0.149 THz), and the spectral range is 2531.84 cm−1 (75.963 THz). We measured the THz Raman spectra of solid powder, aqueous solutions, and mixtures, and studied the effects of environment, container material, and time of measurement on the spectra. The results show that the system is not significantly affected by interference from the water environment and has good stability and repeatability. This method can be applied in many fields such as material detection and environmental protection.
ISSN:2076-3417
2076-3417
DOI:10.3390/app11178094