Abstract
Quantum cascade lasers can be operated as resonantly amplified terahertz de-tectors with wide RF bandwidth. 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 re-spect to the detector temperature are observed up to 80K. The sub-ps intersubband lifetime allows electrical bandwidths as large as 67 GHz as suggested by detection of optical beat-notes from a femtosecond laser.
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