Journal
APPLIED PHYSICS LETTERS
Volume 106, Issue 19, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4921000
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Funding
- Israeli Science Foundation (ISF)
- Israeli Nanotechnology Focal Technology Area on Nanophotonics for Detection
- German-Israeli Foundation (GIF)
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Semiconductor quantum dots are considered to be the leading venue for fabricating on-demand sources of single photons. However, the generation of long-lived dark excitons imposes significant limits on the efficiency of these sources. We demonstrate a technique that optically pumps the dark exciton population and converts it to a bright exciton population, using intermediate excited biexciton states. We show experimentally that our method considerably reduces the dark exciton population while doubling the triggered bright exciton emission, approaching thereby near-unit fidelity of quantum dot depletion. (C) 2015 AIP Publishing LLC.
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