Two-dimensional cuprate nanodetector with single telecom photon sensitivity at T = 20 K
Abstract
Detecting light at the single-photon level is one of the pillars of emergent photonic technologies. This is realized through state-of-the-art superconducting detectors that offer efficient, broadband and fast response. However, the use of low T C superconducting thin films limits their operation temperature to approximately 4 K and below. Here, we demonstrate proof-of-concept nanodetectors based on exfoliated, two-dimensional cuprate superconductor Bi2Sr2CaCu2O8-δ that exhibit single-photon sensitivity at telecom wavelength at a record temperature of T = 20 K. These non-optimized devices exhibit a slow $\left( {\sim\!\! \ {{ms}}} \right)$ reset time and a low detection efficiency ( $\sim\!\!{10^{ - 4}}$ ). We realize the elusive prospect of single-photon sensitivity on a high-T C nanodetector thanks to a novel approach, combining van der Waals fabrication techniques and a non-invasive nanopatterning based on light ion irradiation. This result paves the way for broader application of single-photon technologies, relaxing the cryogenic constraints for single-photon detection at telecom wavelength.
- Publication:
-
2D Materials
- Pub Date:
- April 2023
- DOI:
- 10.1088/2053-1583/acb4a8
- Bibcode:
- 2023TDM....10b1001M
- Keywords:
-
- 2D;
- cuprate;
- nanodetector;
- telecom;
- photon;
- nanowire;
- He-FIB