Transport at Nanoscale Interfaces Laboratory

Terahertz ptychography

Valzania, L., Feurer, T., Zolliker, P., & Hack, E.;

Optics Letters, 43(3), 543-546.;

realized a phase retrieval technique using terahertz (THz) radiation as an alternative to THz digital holography, named THz ptychography. Ptychography has been used in x-ray imaging as a groundbreaking improvement of conventional coherent diffraction imaging. Here we show that ptychography can be performed at THz frequencies too. We reconstructed an amplitude and a phase object with both simulated and real data. Lateral resolution accounts to <2𝜆, while depth variations as low as 𝜆/30 can be assessed.