Berlin 2008 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 51: Poster IV
HL 51.17: Poster
Thursday, February 28, 2008, 16:30–19:00, Poster D
Towards efficient detection of single photons at telecommunication wavelengths — •Gesine Steudle1, Sander Dorenbos2, Ingmar Müller1, Elisabeth Reiger2, Val Zwiller2, and Oliver Benson1 — 1Humboldt-Universität zu Berlin, AG Nano-Optik, Hausvogteiplatz 5-7, 10117 Berlin, Germany — 2TU Delft, Kavli Institute of Nanoscience, Lorentzweg 1, 2628 CJ Delft, Netherlands
One of the main challenges of fiber-based single photon devices is the efficient and feasible detection of single photons at telecommunication wavelengths. A promising approach is the use of superconducting detectors. In our case these detectors consist of a small superconducting wire which is arranged in a meander. The wire structure is made of thin NbN layers by electron beam lithography. To provide optimal coupling to the experimental setup a 1.55 μm single mode fiber is glued directly on the detector area. The main advantages of this type of detectors are high count rates of the order of 1 Ghz, a time resolution below 100 ps and quantum efficiencies of 10 - 15 % at 1.55 μm. Further on one can improve the quantum efficiency by adding a cavity structure and increase the count rate using an array of parallel meanders.