We present a study on the resolution limits and resolution factors of terahertz (THz) ptychography. Simulations of a binary amplitude object show that ptychography shares the same intrinsic resolution factors with digital holography, i.e. it is diffraction-limited. Reconstructions of amplitude and phase objects obtained from holographic and ptychographic experiments are comparable. A lateral resolution of around one wavelength λ is achieved on an amplitude object, while a depth resolution of around λ/5 is reported on a weakly diffracting phase object. THz ptychography is expected to complement THz holography for imaging biological samples and THz transparent specimens.
Lorenzo Valzania, Erwin Hack, Peter Zolliker, Rolf Brönnimann, and Thomas Feurer, "Resolution limits of terahertz ptychography," Proc. SPIE 10677, Unconventional Optical Imaging, 1067720 (Presented at SPIE Photonics Europe: April 26, 2018; Published: 24 May 2018); https://doi.org/10.1117/12.2307157.
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