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arxiv 2211.09422 v1 pith:NXCTEVA5 submitted 2022-11-17 physics.optics physics.ins-det

THz optical beat-note detection with a fast Hot Electron Bolometer operating up to 31 GHz

G. Torrioli , A. Forrer , M. Beck , P. Carelli , F. Chiarello , J. Faist , A. Gaggero , E. Giovine
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F. Martini U. Senica R. Leoni G. Scalari S. Cibella
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classification physics.optics physics.ins-det
keywords opticalbeenbolometerdetectionoperatingresponseaboveadditionally
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We study the performance of an 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 optical 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 cut-off 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/sqrt(Hz) has been measured at 1 MHz.

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