Abstract-Diffraction-limited real-time terahertz imaging by optical frequency up-conversion in a DAST crystal

Diffraction-limited real-time terahertz imaging by optical frequency up-conversion in a DAST crystal Shuzhen Fan, Feng Qi, Takashi Notake, Kouji Nawata, Yuma Takida, Takeshi Matsukawa, and Hiroaki Minamide  »View Author Affiliations

Optics Express, Vol. 23, Issue 6, pp. 7611-7618 (2015)
http://dx.doi.org/10.1364/OE.23.007611

http://www.opticsinfobase.org/oe/abstract.cfm?uri=oe-23-6-7611

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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.

© 2015 Optical Society of America