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Imaging and Spectroscopic Sensing with Low-Repetition-Rate Terahertz Pulses and GaN TeraFET Detectors |
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| Authors: | Daniel Voß Wissem Zouaghi Mehran Jamshidifar Sebastian Boppel Cormac McDonnell James R P Bain Nils Hempler Graeme P A Malcolm Gareth T Maker Maris Bauer Alvydas Lisauskas Adam Rämer Sergey A Shevchenko Wolfgang Heinrich Viktor Krozer Hartmut G Roskos |
| Affiliation: | 1.Physikalisches Institut,Goethe-University Frankfurt,Frankfurt am Main,Germany;2.Lehrstuhl für H?chstfrequenztechnik,University of Siegen,Siegen,Germany;3.M Squared Lasers,Glasgow,Scotland;4.Center for Physical Sciences and Technology,Vilnius University,Vilnius,Lithuania;5.Ferdinand-Braun-Institut, Leibniz-Institut für H?chstfrequenztechnik (FBH),Berlin,Germany |
| 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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