3D Fourier imaging based on 2D heterodyne detection at THz frequencies

  • Holographic imaging techniques, which exploit the coherence properties of light, enable the reconstruction of the 3D scenery being viewed. While the standard approaches for the recording of holographic images require the superposition of scattered light with a reference field, heterodyne detection techniques enable direct measurement of the amplitude and relative phase of the electric light field. Here, we explore heterodyne Fourier imaging and its capabilities using active illumination with continuous-wave radiation at 300 GHz and a raster-scanned antenna-coupled field-effect transistor (TeraFET) for phase-sensitive detection. We demonstrate that the numerical reconstruction of the scenery provides access to depth resolution together with the capability to numerically refocus the image and the capability to detect an object obscured by another object in the beam path. In addition, the digital refocusing capability allows us to employ Fourier imaging also in the case of small lens-object distances (virtual imaging regime), thus allowing high spatial frequencies to pass through the lens, which results in enhanced lateral resolution.

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Author:Hui YuanORCiD, Daniel VoßGND, Alvydas LisauskasORCiDGND, David Mundy, Hartmut RoskosORCiDGND
Parent Title (English):APL photonics
Publisher:AIP Publishing
Place of publication:Melville, NY
Document Type:Article
Year of Completion:2019
Date of first Publication:2019/10/14
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2019/12/23
Issue:10, Art. 106108
Page Number:10
First Page:106108-1
Last Page:106108-9
© 2019 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). https://doi.org/10.1063/1.5116553.
Institutes:Physik / Physik
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Licence (German):License LogoCreative Commons - Namensnennung 4.0