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Open AccessArticle

Spatially Resolved Spectral Imaging by A THz-FEL

1
The Institute of Scientific and Industrial Research (ISIR), Osaka University, 8–1 Mihogaoaka, Ibaraki, Osaka 5670047, Japan
2
Graduate School of Engineering Science, Osaka University, 1–3 Machikaneyama, Toyonaka, Osaka 5608531, Japan
3
Faculty of Science and Engineering, Setsunan University, 17–8 Ikedanaka-Machi, Neyagawa, Osaka 5728508, Japan
4
Department of Physics, Sapienza University, P.le Aldo Moro 5, 00185 Rome, Italy
5
Istituto Nazionale di Fisica Nucleare—Laboratori Nazionali di Frascati (INFN-LNF), Via Enrico Fermi 40, 00044 Frascati, Italy
6
International Centre for Material Science Superstripes, RICMASS, via dei Sabelli 119A, 00185 Rome, Italy
*
Author to whom correspondence should be addressed.
Current address: National Institutes of Natural Sciences, Institute for Molecular Science, UVSOR Facility, 38 Nishigo-Naka, Myodaiji, Okazaki, Aichi 4448585, Japan.
Current address: National Institutes for Quantum and Radiological Science and Technology, 2–4 Shirane, Tokai, Ibaraki 3191106, Japan.
§
Current address: High Energy Accelerator Research Organization, KEK, 1–1 Oho, Tsukuba, Ibaraki 3050801, Japan.
Condens. Matter 2020, 5(2), 38; https://doi.org/10.3390/condmat5020038
Received: 28 April 2020 / Revised: 17 May 2020 / Accepted: 2 June 2020 / Published: 4 June 2020
Using the unique characteristics of the free-electron-laser (FEL), we successfully performed high-sensitivity spectral imaging of different materials in the terahertz (THz) and far-infrared (FIR) domain. THz imaging at various wavelengths was achieved using in situ spectroscopy by means of this wavelength tunable and monochromatic source. In particular, owing to its large intensity and directionality, we could collect high-sensitivity transmission imaging of extremely low-transparency materials and three-dimensional objects in the 3–6 THz range. By accurately identifying the intrinsic absorption wavelength of organic and inorganic materials, we succeeded in the mapping of spatial distribution of individual components. This simple imaging technique using a focusing optics and a raster scan modality has made it possible to set up and carry out fast spectral imaging experiments on different materials in this radiation facility. View Full-Text
Keywords: THz; far infrared; FEL; spectroscopy; imaging THz; far infrared; FEL; spectroscopy; imaging
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Irizawa, A.; Fujimoto, M.; Kawase, K.; Kato, R.; Fujiwara, H.; Higashiya, A.; Macis, S.; Tomarchio, L.; Lupi, S.; Marcelli, A.; Suga, S. Spatially Resolved Spectral Imaging by A THz-FEL. Condens. Matter 2020, 5, 38.

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