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

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9 Author(s)
Cibella, S. ; Istituto di Fotonica e Nanotecnologie, CNR, Via Cineto Romano 42, 00156 Roma, Italy ; Ortolani, M. ; Leoni, R. ; Torrioli, G.
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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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Applied Physics Letters  (Volume:95 ,  Issue: 21 )