Superconducting microwire detectors based on WSi with single-photon sensitivity in the near-infrared
| Autor: | Varun B. Verma, M. D. Shaw, J. P. Allmaras, Jeffrey M. Shainline, Sonia Buckley, Jeff Chiles, Sae Woo Nam, R. P. Mirin, Adriana E. Lita, Boris Korzh |
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| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Superconductivity Photon Fabrication Materials science Physics and Astronomy (miscellaneous) business.industry Detector Near-infrared spectroscopy 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Wavelength 0103 physical sciences Optoelectronics 0210 nano-technology Material properties business Sensitivity (electronics) |
| Zdroj: | Applied Physics Letters. 116:242602 |
| ISSN: | 1077-3118 0003-6951 |
| Popis: | We report on the fabrication and characterization of single-photon-sensitive WSi superconducting detectors with wire widths from 1 μm to 3 μm. The devices achieve the saturated internal detection efficiency at a wavelength of 1.55 μm and exhibit maximum count rates in excess of 105 s−1. We also investigate the material properties of the silicon-rich WSi films used for these devices. We find that many devices with active lengths of several hundred micrometers exhibit critical currents in excess of 50% of the depairing current. A meandered detector with a 2.0 μm wire width is demonstrated over a surface area of 362 × 362 μm2, showcasing the material and device quality achieved. |
| Databáze: | OpenAIRE |
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