| Zugriffsnummer | 47660 |
| Dokumenttyp | Dissertation |
| Peer Review | unbekannt |
| Sprache | Englisch |
| Titel | Semiconductor-based single-photon sources for quantum radiometry and their metrological characterization |
| Autor(in); Institution |
Georgieva, Hristina; 4.5, Angewandte Radiometrie, PTB-Braunschweig
|
| Quelle/Jahr | (2021), VIII, 96, xxiv S. |
| Schriftenreihe | PTB-Bericht PTB-Opt-94 |
| Dissertationsvermerk | Dissertation, Technische Universität Braunschweig, 2021 |
| ISSN | 0341-6712 |
| ISBN | 978-3-95606-652-8 |
| Berichtsnummer | PTB-Opt-94 |
| Verlag | Bremen: Fachverlag NW in der Carl Schünemann Verlag GmbH |
| Zusammenfassung | This work is dedicated to the realization of efficient single-photon sources, which are necessary for reaching high accuracy and metrological traceability in the field of quantum radiometry. Semiconductor quantum dots have promising properties for metrological applications: a spectral emission bandwidth below 50 pm and a decay time of about 1 ns, allowing fast pulsed operation. The InGaAs quantum dots were metrologically characterized regarding their spectral characteristics, single-photon purity, absolute photon flux and absolute optical power. High efficiency of the self-made confocal setup is obtained by combining high transmission objectives with ultra-narrow bandpass filters for low-loss spectral filtering. The light extraction efficiency of the sample is enhanced by integrating a single quantum dot into a monolithic microlens or micromesa. The highest measured photon flux at the detector was (2.55 ± 0.02) · 106 s-1, which corresponds to a radiant flux of (545 ± 4) fW. The g(2) (0) value increased with the count rate, but it remained below 0.25 even for photon fluxes close to saturation. An Allan deviation analysis of the count rate stability yielded an optimal averaging time of 92 s. The feasibility of the direct implementation of this single-photon source in quantum radiometry is demonstrated by a calibration of the detection efficiency of a single-photon avalanche detector (SPAD). A relative calibration using the fiber exchange technique reached a relative standard uncertainty of 0.7 % for the ratio of detection efficiencies of two Si-SPADs. Moreover, an absolute calibration was performed by a direct comparison of a SPAD with a calibrated low-noise analog detector via the substitution method. The relative standard uncertainties at different count rates varied between 0.9 % and 3.2 %. At low photon fluxes, the results were consistent with the standard calibration technique with attenuated laser light. At high photon fluxes, the diminished nonlinearity of the apparent detection efficiency proved the superior properties of semiconductor quantum dots over laser light for applications in the field of quantum radiometry. |
| Themenbereich der Metrologie | Photometrie und Radiometrie |
| Forschungsprojekt | 17FUN06: SIQUST: Single-photon sources as new quantum standards |
| Förderinformationen (1) |
Förderername: European Commission (EC)
Förderer ID: 0000 0001 2242 8989 Förderer ID Typ: ISNI Förderprogramm: EMPIR 2017 Fundamental Titel der Förderung: 17FUN06: SIQUST: Single-photon sources as new quantum standards Förderungsnummer: 17FUN06 |