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. 2023 May 8;31(10):15942-15952.
doi: 10.1364/OE.481081.

THz optical beat-note detection with a fast superconducting hot electron bolometer operating up to 31 GHz

G Torrioli, A Forrer, M Beck, P Carelli, F Chiarello, J Faist, A Gaggero, E Giovine, F Martini, U Senica, R Leoni, G Scalari, S Cibella

THz optical beat-note detection with a fast superconducting hot electron bolometer operating up to 31 GHz

G Torrioli et al. Opt Express. .

Abstract

We study the performance of a hot-electron bolometer (HEB) operating at THz frequencies based on superconducting niobium nitride films. We report on the voltage response of the detector over a large electrical detection bandwidth carried out with different THz sources. We show that the impulse response of the fully packaged HEB at 7.5 K has a 3 dB cutoff around 2 GHz. Remarkably, detection capability is still observed above 30 GHz in an heterodyne beating experiment using a THz quantum cascade laser frequency comb. Additionally, the HEB sensitivity has been evaluated and an optical noise equivalent power NEP of 0.8 pW/√H z has been measured at 1 MHz.

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