High Efficiency Superconducting Single-Photon Detectors Evanescently Coupled to Laser Written Waveguides

SNSPDs evanescently coupled to silicon waveguides can have low overall system efficiency (~2% [1]) due to mode mismatch with optical fibers. We propose to improve this by substituting the silicon waveguides with silica waveguides, such as fibers or laser-written waveguides. Here we present simulation results, as well as our fabrication progress for such devices.