Energy resolution of a superconductor quantum detector

Details Energy resolution of a superconductor quantum detector Energy resolution of a superconductor quantum detector

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004spie.5499..310s&link_type=abstract

Optical and Infrared Detectors for Astronomy. Edited by James D. Garnett and James W. Beletic. Proceedings of the SPIE, Volume 5

Astronomy and Astrophysics

Astronomy

Scientific paper

We report on the energy resolution of a recently developed superconductor single-photon quantum detector. In a superconducting strip quasiparticles created by a single absorbed photon and a bias current jointly cause a normal domain and, subsequently, a voltage transient that manifests absorption of the photon. Given a constant optical coupling, the mechanism suggests a moderate to good energy resolution in the wavelength range from near-infrared to X-rays. We implemented a meander line from a 80-nm wide and 5-nm thick NbN strip to detect single near-infrared photons with the repetition rate 5•107 sec-1 and quantum efficiency of few per cent. Although with this detector operated at 2 K we have indeed observed photon-energy dependent detector response, the energy resolving capability appeared smaller than the detector model predicted. We suggest that the inconsistency owes to the influence of the bias current.

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