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Imaging and Spectroscopic Sensing with Low-Repetition-Rate Terahertz Pulses and GaN TeraFET Detectors

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Abstract

Aiming for non-destructive testing and security applications, we investigate transmission-mode imaging and spectroscopic sensing using terahertz (THz) pulses from a commercial optical parametric oscillator (OPO) in combination with THz detectors based on antenna-coupled field-effect transistors (TeraFETs). The Q-switched OPO generates quasi-continuous-wave THz pulses with a peak power of up to 1 W at a repetition rate between 12 and 90 Hz. The pulses are frequency-tunable between 0.7 and 2.6 THz with a typical linewidth of 50 GHz. We explore detection with fast GaN/AlGaN TeraFETs which hold the potential for multi-pixel and homodyne detection.

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Funding

This work was funded by the European Union via Marie Curie Action “Industry-Academia Partnership and Pathways,” project: “Hyper Spectral Imaging and Sensing” (HYPERIAS), and by the Leibniz-Gemeinschaft under grant SAW-2014-FBH-1 334 TSPIG. One of us (A.L.) gratefully acknowledges the support from the Research Council of Lithuania under contract LAT-04/2016. The authors are further grateful for partial financial support in the frame of the Marie Curie European Training Networks ITN CELTA, contract no. 675683.

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Correspondence to Daniel Voß.

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Voß, D., Zouaghi, W., Jamshidifar, M. et al. Imaging and Spectroscopic Sensing with Low-Repetition-Rate Terahertz Pulses and GaN TeraFET Detectors. J Infrared Milli Terahz Waves 39, 262–272 (2018). https://doi.org/10.1007/s10762-017-0447-1

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  • DOI: https://doi.org/10.1007/s10762-017-0447-1

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