C. Tang, Y. Zhao, F. Tan, D. Wang, L. Rong, M. Georges
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https://www.spiedigitallibrary.org/conference-proceedings-of-spie/11351/1135116/Terahertz-reflective-ptychography/10.1117/12.2559209.full
As a widely used lensless coherent diffraction imaging
approach, ptychography has recently been implemented in Terahertz range.
Combining with the unique penetration property of THz radiation, THz
ptychography allows inspecting visually opaque samples and retrieving both
amplitude and phase information. Here, we demonstrate for the first time to our
knowledge, THz ptychography in reflective configuration. Due to the large
wavelength (96.5 μm), THz ptychography requires small recording distance.
Particular care has been taken in the experimental setup to minimize the
recording distance. Extended ptychographic iterative engine (ePIE) is applied
to reconstruct quantitatively the amplitude and phase information of the object
wavefront. A lateral resolution of 180 μm and a depth resolution of 1.1μm are
achieved
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