Energy resolution of terahertz single-photon-sensitive bolometric detectors

Creators: Santavicca, D. F.; Reulet, B.; Karasik, B. S.; Pereverzev, S. V.; Olaya, D.; Gershenson, M. E.; Frunzio, L.; Prober, D. E.

Abstract

We report measurements of the energy resolution of ultrasensitive superconducting bolometric detectors. The device is a superconducting titanium nanobridge with niobium contacts. A fast microwave pulse is used to simulate a single higher-frequency photon, where the absorbed energy of the pulse is equal to the photon energy. This technique allows precise calibration of the input coupling and avoids problems with unwanted background photons. Present devices have an intrinsic full-width at half-maximum energy resolution of approximately 23 THz, near the predicted value due to intrinsic thermal fluctuation noise.

Additional Information

© 2010 American Institute of Physics. �Received 18 May 2009; accepted 5 February 2010; published online 25 February 2010�. The work at Yale was supported in part by NSF-DMR-0907082, NSF-CHE-0616875, and Yale University. The work by B.K. and S.P. was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration. The work at Rutgers was supported in part by NSF-ECS-0608842 and the Rutgers Academic Excellence Fund. B.R. acknowledges Yale support from the Flint Fund for Nanoscience for research visits during the summers of 2008 and 2009. L.F. acknowledges partial support from CNR-Istituto di Cibernetica, Pozzuoli, Italy.

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