| Autor: |
Dryazgov, Mikhail, Korneeva, Yuliya, Korneev, Alexander |
| Předmět: |
|
| Zdroj: |
AIP Conference Proceedings; 2023, Vol. 2872 Issue 1, p1-6, 6p |
| Abstrakt: |
Superconducting single photon detectors (SSPD or SNSPD) are excellent for detecting single photons. The principle of their operation is based on a local violation of superconductivity as a result of an absorbed photon, the formation of a hot spot with a normal domain, followed by a voltage pulse. Recent studies show that SSPDs based on micron-wide strips can also detect single photons. SSPDs can be used to distinguish between single-photon, two-photon and many-photon events by the amplitude of the voltage pulse if a proper impedance transformer is used, or by the shape of the front edge of the voltage pulse when using high frequency read-out and subsequent pulse shape analysis. However, in all cases it is considered that two photons are absorbed and form hot spots simultaneously. In a real experiment however, two photons have different optical paths and as a consequence a bit different arrival times. In this work, electrothermal simulation of the evolution of two hot spots formed with a time delay is carried out in the two-dimensional case. The possibility of distinguishing two-photon events from single-photon events is estimated for different delay values for different readout schemes. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
