Abstract
We report on the performance of large area NbN nanowire superconducting single-photon detectors (SSPDs). 20×20 µ m2 area SSPDs with 80 and 100 nm linewidths and 50% fill factor were fabricated in 4-nm -thick NbN films grown on single-crystal MgO substrates. The high quality of the devices was verified by electrical and optical testing and compares favorably to measurements of 10×10 µ m2 area SSPDs. Measurements of kinetic inductance versus bias current indicate that the constriction density is low. The fiber-coupled detection efficiency of the devices was 0.4%-3.5% at 100 Hz dark count rate. © 2008 American Institute of Physics.
Original language | English |
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Article number | 061116 |
Pages (from-to) | - |
Number of pages | 3 |
Journal | Applied Physics Letters |
Volume | 92 |
Issue number | 6 |
DOIs | |
Publication status | Published - 11 Feb 2008 |