Wide dynamic range terahertz detector pixel for active spectroscopic imaging with quantum cascade lasers

Cibella, S.; Ortolani, M.; Leoni, R.; Torrioli, G.; Mahler, L.; Ji-Hua Xu; Tredicucci, A.; Beere, H. E.; Ritchie, D. A.
November 2009
Applied Physics Letters;11/23/2009, Vol. 95 Issue 21, p213501
Academic Journal
A superconducting bolometer with an on-chip lithographic terahertz antenna has been illuminated by two quantum cascade lasers operating at 2.5 and 4.4 THz. The detector displays a 1.2 μs time constant, a noise equivalent power of 20 fW/Hz1/2 and a 60 dB dynamic range. We fabricated a monolithic prototype detector array of five elements. This scalable detector is a suitable candidate for terahertz spectroscopic imaging systems, as it can measure both full illuminator power and strongly attenuated or diffuse reflected signals in subsequent frames.


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