Journal
JOURNAL OF INFRARED MILLIMETER AND TERAHERTZ WAVES
Volume 38, Issue 10, Pages 1183-1188Publisher
SPRINGER
DOI: 10.1007/s10762-017-0407-9
Keywords
Submillimeter-wave detector; Field effect transistor; Terahertz quantum cascade laser; Pulsed mode operation; Rectification
Funding
- Research Council of Lithuania [TAP LZ-06/2015]
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In this paper, we report on efficient detection of the radiation emitted by a THz quantum cascade laser (QCL) using an antenna-coupled field effect transistor (TeraFET). In the limiting case when all radiated power would be collected, the investigated TeraFET can show up to 230 V/W responsivity with the noise equivalent power being as low as 85 pW/ at 3.1 THz, which is several times lower than that of the typical Golay cell. A combination of the QCL and a set of off-axis parabolic mirrors with 3-inch and 2-inch focal lengths was used to measure the signal-to-noise ratio (SNR) of the TeraFET. The practically achieved SNR was five times lower than that of the Golay cell and two orders of magnitude lower than a bolometer's. However, TeraFETs are much faster and do not need a signal modulation, thus can be used both in a continuous mode for power monitoring or for investigation of transient processes on a sub-microsecond time scale.
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