Enabling fast polarization THz imaging using broadband dual-polarization SiGe HBT detectors

Marcel Andree; Vishal S. Jagtap; Janusz Grzyb; Ullrich R. Pfeiffer

doi:10.1117/12.2678549

17 October 2023 Enabling fast polarization THz imaging using broadband dual-polarization SiGe HBT detectors

Marcel Andree, Vishal S. Jagtap, Janusz Grzyb, Ullrich R. Pfeiffer

Proceedings Volume 12740, Emerging Imaging and Sensing Technologies for Security and Defence VIII; 127400J (2023) https://doi.org/10.1117/12.2678549
Event: SPIE Security + Defence, 2023, Amsterdam, Netherlands

Abstract

A compact receiver module comprising broadband silicon integrated dual-polarized antenna-coupled heterojunction bipolar transistor (HBT) detectors is implemented as THz polarization imager. Polarization imaging through the Stokes vector formulation captures the scattering of light due to the interaction of light-matter at the interfaces thereby providing the insights on optical activity of the object which otherwise are not observed in conventional spectroscopy or classical imaging. A typical polarization imager requires detection of orthogonal linear and circular polarizations simultaneously. As compared to visible wavelengths where the abundant natural radiation can be split and maneuvered using low loss optomechanical components to record different polarization states, terahertz radiation is weak and lossy optomechanical components pose challenges in performing polarization imaging at terahertz wavelengths. The dual-polarized antenna-coupled detectors packaged as a single pixel can detect orthogonal polarizations simultaneously with isolation below -30 dB thereby minimizing the required optomechanics in polarization imaging set-up. Each detector exhibits a peak responsivity of 5.6 kV/W and minimum NEP of 3 pW/√ Hz at 450 GHz with a broad 10 dB detection bandwidth of 750 GHz (from 250 GHz to 1 THz). These highly sensitive detectors offer a cost-effective alternative to perform frequency domain spectroscopy and imaging. Here, these detectors are implemented to demonstrate polarization imaging at 852 GHz on a diffusive Teflon object. The finer local physical fingerprints of an imprinted Teflon object are computed using the Stokes vector formulation on the orthogonally polarized transmission images.

Conference Presentation

Citation Download Citation

Marcel Andree, Vishal S. Jagtap, Janusz Grzyb, and Ullrich R. Pfeiffer "Enabling fast polarization THz imaging using broadband dual-polarization SiGe HBT detectors", Proc. SPIE 12740, Emerging Imaging and Sensing Technologies for Security and Defence VIII, 127400J (17 October 2023); https://doi.org/10.1117/12.2678549

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