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Terahertz phase retrieval imaging in reflection.

Nikolay V Petrov, Jean-Baptiste Perraud, Adrien Chopard

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    Terahertz phase retrieval was implemented in reflection geometry using a novel double parallel recording scheme. This method enhances signal-to-noise ratio for accurate complex wave property assessment and surface height mapping.

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    Area of Science:

    • Optics and Photonics
    • Terahertz Science and Technology
    • Wave Propagation

    Background:

    • Terahertz (THz) phase retrieval is crucial for characterizing complex wave properties.
    • Iterative algorithms are commonly used for THz phase retrieval.
    • Reflection geometry offers advantages for certain material analyses.

    Purpose of the Study:

    • To implement and validate THz phase retrieval in reflection geometry.
    • To enhance signal-to-noise ratio (SNR) for improved data accuracy.
    • To develop a method for surface height mapping using reconstructed phase data.

    Main Methods:

    • Utilized a continuous wave (CW) acquisition system at 0.287 THz.
    • Implemented a double parallel recording scheme with two lock-in amplifiers.
    • Employed a specialized digital interferometric postprocessing procedure.

    Main Results:

    • Achieved high SNR in the measured dataset through the proposed recording scheme.
    • Demonstrated successful THz phase retrieval in reflection geometry.
    • Obtained a surface height map from the reconstructed phase distribution.

    Conclusions:

    • The double parallel recording scheme effectively improves SNR for THz phase retrieval.
    • Reflection geometry THz phase retrieval is feasible and provides valuable surface information.
    • This technique offers a higher numerical aperture compared to conventional imaging methods.