Diffraction-induced edge contrast enhancement for terahertz imaging |
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Authors: | Yingxin Wang Ziran Zhao Zhiqiang Chen Li Zhang Kejun Kang |
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Institution: | Department of Engineering Physics,Tsinghua University,Key Laboratory of Particle and Radiation Imaging Tsinghua University,Ministry of Education of China,Beijing 100084,China |
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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 st... |
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