期刊
NANO LETTERS
卷 20, 期 8, 页码 5909-5915出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c01859
关键词
Optical gain; colloidal quantum dots; stimulated emission; infrared; doping
类别
资金
- European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program [725165]
- Spanish Ministry of Economy and Competitiveness (MINECO)
- 'Fondo Europeo de Desarrollo Regional' (FEDER) [TEC201788655-R]
- Fundacio Privada Cellex
- program CERCA
- Spanish Ministry of Economy and Competitiveness through the Severo Ochoa Programme for Centres of Excellence in RD [SEV-2015-0522]
- Marie Curie Standard European Fellowship (NAROBAND) [H2020-MSCA-IF-2016-750600]
- Ministerio de Economia, Industria y Competitividad of Spain via a Juan de la Cierva fellowship
Materials with optical gain in the infrared are of paramount importance for optical communications, medical diagnostics, and silicon photonics. The current technology is based either on costly III-V semiconductors that are not monolithic to silicon CMOS technology or Er-doped fiber technology that does not make use of the full fiber transparency window. Colloidal quantum dots (CQDs) offer a unique opportunity as an optical gain medium in view of their tunable bandgap, solution processability, and CMOS compatibility. The 8-fold degeneracy of infrared CQDs based on Pb-chalcogenides has hindered the demonstration of low-threshold optical gain and lasing, at room temperature. We demonstrate room-temperature, infrared, size-tunable, band-edge stimulated emission with a line width of similar to 14 meV. Leveraging robust electronic doping and charge-exciton interactions in PbS CQD thin films, we reach a gain threshold at the single exciton regime representing a 4-fold reduction from the theoretical limit of an 8-fold degenerate system, with a net modal gain in excess of 100 cm(-1).
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