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IEEE Toronto International Conference on Science and Technology for Humanity, TORONTO : Canada (2009)

Mapping of the Quantum Efficiency of a Superconducting Single Electron Detector

Adrian Lupascu 1, 2, Andreas Emmert 1, Michel Brune 1, Gilles Nogues 1, 3, Michael Rosticher 4, F.-R. Ladan 4, J.-P. Maneval 4, J.-C. Villegier 5

(2009)

Superconducting NbN wires have recently received attention as detectors for visible and infrared photons [1]. We present experiments in which we use a NbN wire for high-efficiency (similar or equal to 40%) detection of single electrons with keV energy. We use the beam of a scanning electron microscope as a focussed, stable, and calibrated electron source. Scanning the beam over the surface of the wire provides a map of the detection efficiency. This map shows features as small as 150 nm, revealing wire inhomogeneities. The intrinsic resolution of this mapping method, superior to optical methods, provides the basis of a characterization tool relevant for photon detectors.

1 :	Laboratoire Kastler Brossel (LKB (Lhomond))
	CNRS : UMR8552 – Université Pierre et Marie Curie [UPMC] - Paris VI – Ecole normale supérieure de Paris - ENS Paris
2 :	Institute for Quantum Computing
	University of Waterloo
3 :	Institut Néel (NEEL)
	CNRS : UPR2940 – Université Joseph Fourier - Grenoble I – Institut National Polytechnique de Grenoble (INPG)
4 :	Laboratoire Pierre Aigrain (LPA)
	CNRS : UMR8551 – Université Pierre et Marie Curie [UPMC] - Paris VI – Université Paris VII - Paris Diderot – Ecole normale supérieure de Paris - ENS Paris
5 :	Institut Nanosciences et Cryogénie/SPSMS
	CEA

Domaine

:

Physique/Matière Condensée/Supraconductivité

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Contributeur : Michael Rosticher <>

Soumis le : Lundi 8 Novembre 2010, 16:45:05

Dernière modification le : Lundi 29 Novembre 2010, 09:22:31