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| Content Provider | Springer Nature Link |
|---|---|
| Author | Kozorezov, A. G. Wigmore, J. K. Martin, D. Verhoeve, P. Peacock, A. |
| Copyright Year | 2008 |
| Abstract | We have identified an important, new source of line broadening in single photon detectors that work on the principle of absorption in a thin metal film. Phonon down-conversion noise arises through the loss of high energy phonons into the substrate during the initial photon energy down-conversion stage. Because of the relatively small number of phonons initially involved in this process, the loss rate is subject to large fluctuations due to the statistical nature of the energy exchange processes. We have modelled the phonon down-conversion noise that arises in the final stage of the down-conversion cascade, during which the deposited energy is converted into predominantly electronic excitations. At this stage of down-conversion in thin films the cascade phonon energy is sufficiently small that the escape interfaces are accessible for all phonons. Solving the system of coupled integral equations for the interacting electron and phonon systems, we have derived explicit expressions for the variance of the deposited energy. We have compared the results with other known noise contributions for the two foremost types of single optical photon detectors, based on superconducting tunnel junctions and transition edge sensors. |
| Starting Page | 51 |
| Ending Page | 57 |
| Page Count | 7 |
| File Format | |
| ISSN | 00222291 |
| Journal | Journal of Low Temperature Physics |
| Volume Number | 151 |
| Issue Number | 1-2 |
| e-ISSN | 15737357 |
| Language | English |
| Publisher | Springer US |
| Publisher Date | 2008-01-11 |
| Publisher Place | Boston |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Energy down-conversion Thermalization Tunneling phenomena; Josephson effects Superconducting optical, X-ray, and ?-ray detectors Magnetism, Magnetic Materials Characterization and Evaluation of Materials Condensed Matter |
| Content Type | Text |
| Resource Type | Article |
| Subject | Atomic and Molecular Physics, and Optics Condensed Matter Physics Materials Science |
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