Room-temperature single photon sources with definite circular and linear polarizations
| Autor: | Luke J. Bissell, Svetlana G. Lukishova, Carlos R. Stroud, Robert W. Boyd |
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| Rok vydání: | 2010 |
| Předmět: |
Materials science
Photon business.industry Linear polarization Physics::Optics Quantum key distribution Polarization (waves) Molecular physics Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Condensed Matter::Soft Condensed Matter Quantum dot Liquid crystal Optoelectronics Photonics business Circular polarization |
| Zdroj: | Optics and Spectroscopy. 108:417-424 |
| ISSN: | 1562-6911 0030-400X |
| Popis: | We report experimental results of two room-temperature single photon sources with definite polarization based on emitters embedded in either cholesteric or nematic liquid crystal hosts. In the first case, a cholesteric 1-D photonic bandgap microcavity provides circular polarization of definite handedness of single photons from single colloidal semiconductor quantum dots (nanocrystals). In these experiments, the spectral position of the quantum dot fluorescence maximum is at the bandedge of a photonic bandgap structure. The host does not destroy fluorescence antibunching of single emitters. In the second case, photons with definite linear polarization are obtained from single dye molecules doped in a planar-aligned nematic liquid crystal host. The combination of sources with definite linear and circular polarization states of single photons can be used in a practical implementation of the BB84 quantum key distribution protocol. |
| Databáze: | OpenAIRE |
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