This research develops a superconducting single-photon detector with a parabolic mirror, suggesting improved light collection efficiency and reduced dead time.
This work presents the research and development of a superconducting single-photon detector (SNSPD) integrated with a parabolic mirror fabricated in a silicon wafer by focused ion beam etching. Using FDTD simulations of electromagnetic field distribution within the mirror and on its surface, the geometry of the molybdenum mirror was designed for efficient collection of light into 1.5 µm spot. The reduction of SNSPD area to 1.5x1.5 µm 2 resulted in low kinetic inductance and faster operation. Although the detector response is presently limited by 1 GHz band of read-out electronics, the simulation suggests the reduction of the detector dead time to 348 ps.
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Vovk et al. (2025) studied this question.
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