Chinese Optics Letters, 2009, 7 (8): 08690, Published Online: Aug. 17, 2009  

Diffraction-induced edge contrast enhancement for terahertz imaging

Author Affiliations
Department of Engineering Physics, Tsinghua University, Key Laboratory of Particle and Radiation Imaging (Tsinghua University), Ministry of Education of China, Beijing 100084, China
Abstract
Contrast enhancement is particularly important for imaging of weakly absorbing materials. We demonstrate the inherent contrast-enhancement effect at the edges of a transparent object by using a conventional pulsed terahertz imaging setup without additional modification of the system design. We provide both experimental and theoretical evidence suggesting that this effect is a consequence of the frequency-dependent energy loss of the terahertz radiation induced by edge diffraction. The influence of the phase step of the broadband terahertz pulses on the edge contrast is discussed.

Yingxin Wang, Ziran Zhao, Zhiqiang Chen, Li Zhang, Kejun Kang. Diffraction-induced edge contrast enhancement for terahertz imaging[J]. Chinese Optics Letters, 2009, 7(8): 08690.

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