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Spectroscopic imaging by two-dimensional electrooptic sampling in the terahertz region



  1. Research Center for Development of Far-Infrared Region, University of Fukui, 3-9-1 Bunkyo Fukui, Fukui 910-8507, Japan
  2. Institute of Laser Engineering, Osaka University, 2-6 Yamadaoka, Suita, Osaka 565-0871, Japan


A terahertz (THz) time-domain imaging system is developed based on two-dimensional electrooptic sampling with a high-speed complementary metal-oxide semiconductor camera. Spectroscopic images are observed under nondestructive and noncontact conditions to demonstrate transmissive imaging of an L-cystine chip embedded in a polyethylene pellet. Time waveforms that have a time period of 68.1 ps are acquired for 16384 pixels within six minutes during the observation. The L-cystine chip, which has a fingerprint spectrum in the THz region, is depicted clearly in the spectroscopic image at the fingerprint frequency by reassembling the image from the spectrum obtained by Fourier transform of the acquired time waveforms..


THz, Time-domain spectroscopy, Spectroscopic imaging, Two-dimensional imaging.

Submitted at: Sept. 3, 2018
Accepted at: Nov. 29, 2018


H. KITAHARA, M. TANI, M. HANGYO, Spectroscopic imaging by two-dimensional electrooptic sampling in the terahertz region, Journal of Optoelectronics and Advanced Materials Vol. 20, Iss. 11-12, pp. 581-585 (2018)