Title :
Calibration free terahertz imaging based on 2D electro-optic sampling technique
Author :
Usami, M. ; Fukasawa, R. ; Tani, M. ; Watanabe, M. ; Sakai, K.
Author_Institution :
TOCHIGI Nikon Corp., Japan
Abstract :
A two-dimensional electro-optic sampling technique with polarity modulation for THz imaging is proposed and demonstrated. The polarity modulation greatly improves the signal linearity to the THz field. Combining this technique with software lock-in detection, it is found that the modulation efficiency is also improved compared to conventional optical chopping.
Keywords :
CCD image sensors; electro-optical modulation; signal sampling; submillimetre wave imaging; CCD camera; calibration free terahertz imaging; large-aperture photoconductive antenna; modulation efficiency; polarity modulation; signal linearity; software lock-in detection; time-domain spectroscopic imaging; two-dimensional electro-optic sampling;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:20031112
