TY  - JOUR
A1  - Yuan, Hui
A1  - Voß, Daniel
A1  - Lisauskas, Alvydas
A1  - Mundy, David
A1  - Roskos, Hartmut
T1  - 3D Fourier imaging based on 2D heterodyne detection at THz frequencies
T2  - APL photonics
N2  - 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.
Y1  - 2019
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/52587
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-525878
SN  - 2378-0967
N1  - © 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.
VL  - 4
IS  - 10, Art. 106108
SP  - 106108-1
EP  - 106108-9
PB  - AIP Publishing
CY  - Melville, NY
ER  -