Hongxiang Liu1,2,4, Yuye Wang1,2,3,4, Degang Xu1,2, Limin Wu1,2, Chao Yan1,2, Dexian Yan1,2, Longhuang Tang1,2, Yixin He1,2, Hua Feng3 and Jianquan Yao
http://iopscience.iop.org/article/10.1088/1361-6463/aa7d9a/pdf
We demonstrate an attenuated total internal reflection imaging system. The surface information of the sample on top of a prism can be acquired by two-dimensionally scanning this prism moving in the vertical plane with horizontally incident continuous terahertz waves at a fixed height. The principles and feasibility of this method are investigated. The effective imaging area on the prism, image resolution and polarization dependence of contrast enhancement and stability improvement are analyzed. Examples including solid agar, distilled water and porcine tissue are presented, demonstrating the method's advantages of high sensitivity and simple sample preparation. The experimental and theoretical results consistently show that p-polarization contributes to enhanced image contrast and more stable intensity of the attenuated total internal reflected signal.
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