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
Full Article | PDF ArticleMore Like This
Elizaveta G. Tsiplakova, Jean-Baptiste Perraud, Adrien Chopard, Jean-Paul Guillet, Patrick Mounaix, and Nikolay V. Petrov
Opt. Lett. 48(21) 5463-5466 (2023)
Nathaniel Hai and Joseph Rosen
Opt. Lett. 45(20) 5812-5815 (2020)
Erik Malm, Edwin Fohtung, and Anders Mikkelsen
Opt. Lett. 46(1) 13-16 (2021)