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Single-mode tunable laser emission in the single-exciton regime from colloidal nanocrystals

Single-mode tunable laser emission in the single-exciton regime from colloidal nanocrystals
Single-mode tunable laser emission in the single-exciton regime from colloidal nanocrystals
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.
physical sciences, nanotechnology, optical physics
1-9
Grivas, Christos
7f564818-0ac0-4127-82a7-22e87ac35f1a
Li, Chunyong
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Andreakou, Peristera
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Wang, Pengfei
a1ba240f-d4f0-4150-bcd8-cb418e841dcb
Ding, Ming
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Brambilla, Gilberto
815d9712-62c7-47d1-8860-9451a363a6c8
Manna, Liberato
887c7089-35b3-4ba3-b7a5-ae62e7ae9d36
Lagoudakis, Pavlos
ea50c228-f006-4edf-8459-60015d961bbf
Grivas, Christos
7f564818-0ac0-4127-82a7-22e87ac35f1a
Li, Chunyong
ff2101ab-4b9b-463e-966e-a4e0414dc184
Andreakou, Peristera
f4543e45-66d7-49c9-a247-e09c0d822157
Wang, Pengfei
a1ba240f-d4f0-4150-bcd8-cb418e841dcb
Ding, Ming
e9c86fb2-c1f5-4720-be85-0b56b8f75b3a
Brambilla, Gilberto
815d9712-62c7-47d1-8860-9451a363a6c8
Manna, Liberato
887c7089-35b3-4ba3-b7a5-ae62e7ae9d36
Lagoudakis, Pavlos
ea50c228-f006-4edf-8459-60015d961bbf

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).

Record type: Article

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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Published date: 23 August 2013
Keywords: physical sciences, nanotechnology, optical physics
Organisations: Optoelectronics Research Centre, Quantum, Light & Matter Group

Identifiers

Local EPrints ID: 356365
URI: http://eprints.soton.ac.uk/id/eprint/356365
PURE UUID: 2791c66b-9d38-46c3-aa32-9148d3b8c798

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Date deposited: 12 Sep 2013 17:00
Last modified: 02 Dec 2019 20:48

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