Quantum dots as single-photon sources: Antibunching via two-photon excitation
| Autor: | Uli Lemmer, Matthias D. Wissert, Birgit Rudat, Hans-Jürgen Eisler |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
Physics
Photon Photon antibunching Quantum point contact Physics::Optics Photodetection Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Condensed Matter Physics Electronic Optical and Magnetic Materials Condensed Matter::Materials Science Two-photon excitation microscopy Quantum dot Quantum dot laser Quantum information Atomic physics |
| Zdroj: | Physical Review B. 83 |
| ISSN: | 1550-235X 1098-0121 |
| DOI: | 10.1103/physrevb.83.113304 |
| Popis: | Two-photon excitation induced photoluminescence (2PE-PL) microscopy of CdSe colloidal quantum dots at the single-entity level is demonstrated. We provide evidence for single nanoparticle microscopy in the two-photon excitation regime by varying the laser excitation average power, as well as by measuring the confocal point spread function in three dimensions with a single quantum dot. Model calculations of the point spread function are in good agreement with our experimental findings in the 2PE-PL nonsaturation regime. Ultimately, we observe photon antibunching and triggered single-photon emission at room temperature from those quantum nanostructures under two-photon excitation in a well-defined three-dimensional photonic volume. |
| Databáze: | OpenAIRE |
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