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Asian Journal of Physics Vol 32, Nos 5 – 8 (2023) 253-264

A brief introduction of THz interferometry, confocal, and digital holography

Min Wan
School of Electrical and Electronic Engineering
College of Architecture and Engineering, University College Dublin, Belfield, Dublin 4, Ireland.
Dedicated in memory of Prof John Sheridan

The THz imaging plays an important role in developing of THz applications, e.g., security check, biomedical imaging, and non-destructive inspection. THz instrumentation has improved significantly in recent decades making real time broadband THz imaging possible. In this paper, special attention has been paid to several THz imaging techniques using optical engineering principles: (a) a high-resolution, high-precision THz interferometry system; (b) implementation and calibration of a continuous wave THz transmission confocal (3D) imaging system; (c) continuous wave THz in-line digital holographic system with homodyne and heterodyne detection. Modelling, characterization, and data processing are discussed. We provide perspectives on THz technological challenges and its prospects. © Anita Publications. All rights reserved.
Keywords: Terahertz, Imaging, Interferometry, Confocal, Digital Holography.

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