The 20th International Conference on Low Temperature Detectors (LTD20)
Presentation Code : T-2-6
Presentation Schedule: : July 25, 12:05 ~ 12:20

Superconducting Nanowire Single Photon Detectors for sub-GeV Dark Matter Searches

Jamie Luskin1,2, Christina Wang3,4, Sahil Patel1,3, Emanuel Knehr1, Andrew D. Beyer1, Jason P. Allmaras1, Bruce Bumble1, Daniel N. Shanks1, Emma E. Wollman1, Lautaro Narváez3, Si Xie3,4, Maria Spiropulu3, Stephen Derenzo5, Maurice Garcia-Sciveres5, Cristián Peña4, Boris Korzh1, Matthew D. Shaw1
1Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, United States of America, 2University of Maryland, College Park, MD 20742, United States of America, 3California Institute of Technology, Pasadena, CA 91125, United States of America, 4Fermi National Accelerator Laboratory, Batavia, IL 60510, United States of America, 5Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States of America

Superconducting Nanowire Single Photon Detectors (SNSPDs) are a leading detector technology for time-correlated single-photon counting from the UV to the near-infrared.  Due to their unique combination of low energy thresholds and low intrinsic dark count rates, SNSPDs have become attractive as sensors in low mass dark matter detection experiments. With focused development, these devices can be integrated with cryogenic targets including scintillators, gas cells, and haloscopes optimized to probe DM-electron or DM-nuclear interactions. Many of these applications require large sensor active areas to enable scaling to large target masses in experiments. In this talk, we first highlight the performance of state-of-the-art mm2-scale WSi SNSPD arrays with micron-scale wire widths, and progress towards a systematic study of the temperature dependence of the intrinsic dark counts in this novel class of device. 

One developing DM detection concept sensitive to MeV-scale DM electron recoils uses n-type GaAs as a scintillating target and a large-area SNSPD as the sensor to read out scintillation photons. We discuss recent characterization experiments on milligram-scale targets read out with the mm2 SNSPD arrays, including light yield and photoluminescence timescale measurements. These measurements are unconventional for SNSPDs due to the isotropic nature of scintillation light, and we will discuss developments in detector design that address the accompanying challenges in optical coupling efficiency. We also discuss pathways to scale this proof-of-concept experiment to larger target masses, and, in particular, how this is driving the development of cm2-scale active area SNSPDs through innovations in nanofabrication and multiplexing techniques.

• Presentation Preference : Oral
• Topic : A. Detector Physics & Technologies
- 04. SSPD
• Corresponding Author : Jamie Luskin (NASA Jet Propulsion Laboratory, California Institute of Technology, University of Maryland)
• Presenter : Jamie Luskin (NASA Jet Propulsion Laboratory, California Institute of Technology, University of Maryland)