Terahertz wideband spectroscopic imaging based on two-dimensional electro-optic sampling technique

Usami, Mamoru; Yamashita, Masatsugu; Fukushima, Kazushiro; Otani, Chiko; Kawase, Kodo
April 2005
Applied Physics Letters;4/4/2005, Vol. 86 Issue 14, p141109
Academic Journal
We extended the bandwidth of a terahertz (THz) spectroscopic imaging system based on two-dimensional electro-optic sampling. By using an optical-rectification emitter, formed by a ZnTe crystal, a high-frequency component of more than 2.0 THz was detected. A calibration-free procedure with polarity inversion of the THz beam ensures us precise spectroscopy: the polarity was inverted by rotating the emitter crystal. The spatial patterns of the chemicals were extracted from the THz multispectral images in the extended spectral region.


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