Abstract

Terahertz phase retrieval is a promising technique able to assess the complex diffracted wave properties through an iterative processing algorithm. In this Letter, we demonstrate the implementation of this technique in reflection geometry with a continuous wave acquisition system working at 0.287 THz. To ensure a high signal-to-noise ratio in the measured dataset, we proposed a double parallel recording scheme with one detector and two lock-in amplifiers operating with the complimentary sensitivity setting. This provided a higher numerical aperture than conventional raster-scanning focal plane imaging. A specialized digital interferometric postprocessing procedure was applied to obtain a surface height map from the reconstructed phase distribution in the object’s irradiated area.

© 2020 Optical Society of America

Terahertz diffractive imaging with saturated data inpainting

Elizaveta G. Tsiplakova, Jean-Baptiste Perraud, Adrien Chopard, Jean-Paul Guillet, Patrick Mounaix, and Nikolay V. Petrov
Opt. Lett. 48(21) 5463-5466 (2023)

Phase contrast-based phase retrieval: a bridge between qualitative phase contrast and quantitative phase imaging by phase retrieval algorithms

Nathaniel Hai and Joseph Rosen
Opt. Lett. 45(20) 5812-5815 (2020)

Multi-wavelength phase retrieval for coherent diffractive imaging

Erik Malm, Edwin Fohtung, and Anders Mikkelsen
Opt. Lett. 46(1) 13-16 (2021)

Multi-layered full-field phase imaging using continuous-wave terahertz ptychography

Dayong Wang, Bing Li, Lu Rong, Fangrui Tan, John J. Healy, Jie Zhao, and Yunxin Wang
Opt. Lett. 45(6) 1391-1394 (2020)

Chocolate inspection by means of phase-contrast imaging using multiple-plane terahertz phase retrieval

Mostafa Agour, Claas Falldorf, Fatima Taleb, Martin Koch, Ralf B. Bergmann, and Enrique Castro-Camus
Opt. Lett. 47(13) 3283-3286 (2022)