Abstract
We developed a superconducting nanowire single-photon detector (SNSPD) based on a magnesium fluoride (MgF2) substrate with the aim of producing a high system efficiency (SE) and wideband. The proposed SNSPD on a MgF2 substrate could simultaneously provide: 1) low lattice mismatching of the lattice constant between MgF2and superconducting niobium nitride (NbN) films; 2) a low reflection loss ( ${n}=1.37$ ); and 3) a wide transmission band (0.2– $7~\mu \text{m}$ ). Based on the designed structure, a simulation indicated that the maximum absorption efficiency of the designed SNSPD on the MgF2 substrate is 97%. An SE of 46% at 1064 nm was measured without maximizing the polarization. The SNSPD on the MgF2 substrate was examined in a long-haul laser ranging application over four months, expanding the possibilities for application such as for laser ranging of space debris.
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