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. Show more
Permanent link
https://doi.org/10.3929/ethz-b-000510542Publication status
publishedExternal links
Journal / series
APL PhotonicsVolume
Pages / Article No.
Publisher
American Institute of PhysicsOrganisational unit
02510 - Institut für Quantenelektronik / Institute for Quantum Electronics03759 - Faist, Jérôme / Faist, Jérôme
02205 - FIRST-Lab / FIRST Center for Micro- and Nanoscience
Funding
724344 - On Chip Terahertz Frequency Combs (EC)
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