Author Affiliations
Abstract
Department of Engineering Physics, Tsinghua University, Key Laboratory of Particle and Radiation Imaging (Tsinghua University), Ministry of Education of China, Beijing 100084, China
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.
边缘衍射 太赫兹成像 相位阶跃 110.6795 Terahertz imaging 050.1940 Diffraction 120.4290 Nondestructive testing Chinese Optics Letters
2009, 7(8): 08690