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Journal Articles Optics Letters Year : 2020

Terahertz Phase Retrieval Imaging in Reflection

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.
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Dates and versions

hal-02891064 , version 1 (13-05-2024)

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Nikolai Petrov, Jean-Baptiste Perraud, Adrien Chopard, Jean-Paul Guillet, Olga Smolyanskaya, et al.. Terahertz Phase Retrieval Imaging in Reflection. Optics Letters, 2020, 45 (15), pp.4168-4171. ⟨10.1364/OL.397935⟩. ⟨hal-02891064⟩
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