Open AccessDiffraction-limited real-time terahertz imaging by optical frequency up-conversion in a DAST crystal
Author(s) -
Shuzhen Fan,
Qi Feng,
T. Notake,
Kouji Nawata,
Yuma Takida,
T. Matsukawa,
Hiroaki Minamide
Publication year - 2015
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.23.007611
Subject(s) - terahertz radiation , optics , diffraction , materials science , medical imaging , interference (communication) , terahertz spectroscopy and technology , resolution (logic) , optoelectronics , image resolution , physics , telecommunications , computer science , channel (broadcasting) , artificial intelligence
Real-time terahertz (THz) wave imaging has wide applications in areas such as security, industry, biology, medicine, pharmacy, and the arts. This report describes real-time room-temperature THz imaging by nonlinear optical frequency up-conversion in an organic 4-dimethylamino-N'-methyl-4'-stilbazolium tosylate (DAST) crystal, with high resolution reaching the diffraction limit. THz-wave images were converted to the near infrared region and then captured using an InGaAs camera in a tandem imaging system. The resolution of the imaging system was analyzed. Diffraction and interference of THz wave were observed in the experiments. Videos are supplied to show the interference pattern variation that occurs with sample moving and tilting.