Grivas, Christos, Li, Chunyong, Andreakou, Peristera, Wang, Pengfei, Ding, Ming, Brambilla, Gilberto, Manna, Liberato and Lagoudakis, Pavlos (2013) Single-mode tunable laser emission in the single-exciton regime from colloidal nanocrystals. Nature Communications, 4 (2376), 1-9. (doi:10.1038/ncomms3376).
Abstract
Whispering-gallery-mode resonators have been extensively used in conjunction with different materials for the development of a variety of photonic devices. Among the latter, hybrid structures, consisting of dielectric microspheres and colloidal core/shell semiconductor nanocrystals as gain media, have attracted interest for the development of microlasers and studies of cavity quantum electrodynamic effects. Here we demonstrate single-exciton, single-mode, spectrally tuned lasing from ensembles of optical antenna-designed, colloidal core/shell CdSe/CdS quantum rods deposited on silica microspheres. We obtain single-exciton emission by capitalizing on the band structure of the specific core/shell architecture that strongly localizes holes in the core, and the two-dimensional quantum confinement of electrons across the elongated shell. This creates a type-II conduction band alignment driven by coulombic repulsion that eliminates non-radiative multi-exciton Auger recombination processes, thereby inducing a large exciton–bi-exciton energy shift. Their ultra-low thresholds and single-mode, single-exciton emission make these hybrid lasers appealing for various applications, including quantum information processing.
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- Faculties (pre 2018 reorg) > Faculty of Physical Sciences and Engineering (pre 2018 reorg) > Optoelectronics Research Centre (pre 2018 reorg)
Current Faculties > Faculty of Engineering and Physical Sciences > Zepler Institute for Photonics and Nanoelectronics > Optoelectronics Research Centre (pre 2018 reorg)
Zepler Institute for Photonics and Nanoelectronics > Optoelectronics Research Centre (pre 2018 reorg) - Faculties (pre 2018 reorg) > Faculty of Physical Sciences and Engineering (pre 2018 reorg) > Physics & Astronomy (pre 2018 reorg)
Current Faculties > Faculty of Engineering and Physical Sciences > School of Physics and Astronomy > Physics & Astronomy (pre 2018 reorg)
School of Physics and Astronomy > Physics & Astronomy (pre 2018 reorg) - Faculties (pre 2018 reorg) > Faculty of Physical Sciences and Engineering (pre 2018 reorg) > Physics & Astronomy (pre 2018 reorg) > Quantum, Light & Matter Group (pre 2018 reorg)
Current Faculties > Faculty of Engineering and Physical Sciences > School of Physics and Astronomy > Physics & Astronomy (pre 2018 reorg) > Quantum, Light & Matter Group (pre 2018 reorg)
School of Physics and Astronomy > Physics & Astronomy (pre 2018 reorg) > Quantum, Light & Matter Group (pre 2018 reorg)
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