Large-area NbN superconducting nanowire avalanche photon detectors with saturated detection efficiency
Author(s)Murphy, Ryan P.; Grein, Matthew E.; Gudmundsen, Theodore J.; Najafi, Faraz; Berggren, Karl K.; Marsili, Francesco; Dauler, Eric A.; McCaughan, Adam N.; ... Show more Show less
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Superconducting circuits comprising SNSPDs placed in parallel—superconducting nanowire avalanche photodetectors, or SNAPs—have previously been demonstrated to improve the output signal-to-noise ratio (SNR) by increasing the critical current. In this work, we employ a 2-SNAP superconducting circuit with narrow (40 nm) niobium nitride (NbN) nanowires to improve the system detection efficiency to near-IR photons while maintaining high SNR. Additionally, while previous 2-SNAP demonstrations have added external choke inductance to stabilize the avalanching photocurrent, we show that the external inductance can be entirely folded into the active area by cascading 2-SNAP devices in series to produce a greatly increased active area. We fabricated series-2-SNAP (s2-SNAP) circuits with a nanowire length of 20 μm with cascades of 2-SNAPs providing the choke inductance necessary for SNAP operation. We observed that (1) the detection efficiency saturated at high bias currents, and (2) the 40 nm 2-SNAP circuit critical current was approximately twice that for a 40 nm non-SNAP configuration.
DepartmentLincoln Laboratory; Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science; Massachusetts Institute of Technology. Research Laboratory of Electronics
Proceedings of SPIE--the International Society for Optical Engineering
Murphy, Ryan P., Matthew E. Grein, Theodore J. Gudmundsen, Adam McCaughan, Faraz Najafi, Karl K. Berggren, Francesco Marsili, and Eric A. Dauler. “Large-Area NbN Superconducting Nanowire Avalanche Photon Detectors with Saturated Detection Efficiency.” Edited by Mark A. Itzler and Joe C. Campbell. Advanced Photon Counting Techniques IX (May 13, 2015). © 2015 Society of Photo-Optical Instrumentation Engineers (SPIE)
Final published version