Abstract
Because of the ultrafast and photon-driven nature of the transport in their active region, we demonstrate that quantum cascade lasers can be operated as resonantly amplified terahertz detectors with wide RF bandwidth. Tunable responsivities up to 50 V/W and noise equivalent powers down to 100 pW/Hz1/2 are demonstrated at 4.7 THz. Constant peak responsivities with respect to the detector temperature are observed up to 80 K. Thanks to the ≈ps intersub-band lifetime, electrical bandwidths larger than 20 GHz can be obtained, allowing the detection of optical beatnotes from quantum cascade THz frequency combs.
Highlights
Recent years saw an impressive development in the field of high speed/high frequency devices operating at THz wavelengths
The device consists of a double metal waveguide with a distributed Bragg reflector (DBR) acting as a high reflectivity mirror and a first order distributed feedback (DFB)
We presented the application of the concept of regenerative amplification to THz detection exploiting QCL active regions as the gain medium
Summary
Recent years saw an impressive development in the field of high speed/high frequency devices operating at THz wavelengths. Because of the ultrafast and photon-driven nature of the transport in their active region, we demonstrate that quantum cascade lasers can be operated as resonantly amplified terahertz detectors with wide RF bandwidth.
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