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SUPERCONDUCTING NANOWIRE AVALANCHE PHOTODETECTORS (SNAPS) WITH FAST RESET TIME

United States Patent Application

20130143744
A1
View the Complete Application at the US Patent & Trademark Office
A superconducting nanowire avalanche photodetector (SNAP) with improved high-speed performance. An inductive element may be coupled in series with at least two parallel-coupled nanowires. The nanowires may number 5 or fewer, and may be superconducting and responsive to even a single photon. The series inductor may ensure current diverted from a photon-absorbing nanowire propagates to other nanowires and become amplified. The series inductance may be less than 10 times the nominal inductance per nanowire, and may also be larger than a minimum inductance to avoid spurious outputs in response to a photon absorption. The series inductance may be configured to achieve a desired tradeoff between SNAP reset time and spurious outputs. For example, the series inductance may be configured achieve minimum reset time or maximum bias margin, subject to user-defined constraints. By appropriately configuring the series inductance, a systematic method of designing improved SNAPs may be provided.
Marsili, Francesco (Boulder, CO), Berggren, Karl K. (Arlington, MA)
Massachusetts Institute of Technology (Cambridge MA)
13/ 646,439
October 5, 2012
GOVERNMENT SPONSORSHIP [0002] This invention was made with government support under Grant No. DE-SC0001088 awarded by the Department of Energy. The government has certain rights in the invention.