Muller, T., Skiba-Szymanska, J., Stevenson, R.M. et al. (9 more authors) (2017) Growth scheme for quantum dots with low fine structure splitting at telecom wavelengths (Conference Presentation). In: Quantum Dots and Nanostructures: Growth, Characterization, and Modeling XIV. SPIE OPTO, 2017, San Francisco, California, United States. SPIE ISBN 978-1-5106-0669-2
Abstract
Quantum dots based on InAs/InP hold the promise to deliver entangled photons with wavelength suitable for the standard telecom window around 1550 nm, which makes them predestined to be used in future quantum networks applications based on existing fiber optics infrastructure. A prerequisite for the generation of such entangled photons is a small fine structure splitting (FSS) in the quantum dot excitonic eigenstates, as well as the ability to integrate the dot into photonic structures to enhance and direct its emission. Using optical spectroscopy, we show that a growth strategy based on droplet epitaxy can simultaneously address both issues. Contrary to the standard Stranski-Krastanow technique, droplet epitaxy dots do not rely on material strains during growth, which results in a drastic improvement in dot symmetry. As a consequence, the average exciton FSS is reduced by more than a factor 4, which in fact makes all the difference between easily finding a dot with the required FSS and not finding one at all. Furthermore, we demonstrate that droplet epitaxy dots can be grown on the necessary surface (001) for high quality optical microcavities, which increases dot emission count rates by more than a factor of five. Together, these properties make droplet epitaxy quantum dots readily suitable for the generation of entangled photons at telecom wavelengths.
Metadata
Item Type: | Proceedings Paper |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | Copyright 2017 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited. |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Electronic and Electrical Engineering (Sheffield) |
Funding Information: | Funder Grant number INNOVATE UK (TSB) 70628-492126 TS/P002560/1 |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 25 Oct 2018 12:30 |
Last Modified: | 25 Oct 2018 18:46 |
Published Version: | https://doi.org/10.1117/12.2252159 |
Status: | Published |
Publisher: | SPIE |
Refereed: | Yes |
Identification Number: | 10.1117/12.2252159 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:137725 |