Fig. 5. (Color online) (a) Photograph of the sample with defects for terahertz imaging experiment. (b) Photograph of the sample and the corresponding two-dimensional image of terahertz transmission. The imaging area is 10 mm by 5 mm. (c) Schematic of terahertz pulses transmitted though materials with various thicknesses. (d) Terahertz pulses transmitted through air (black) and the sample at five different points depicted in the figure (b).
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