Bright Single InAsP Quantum Dots at Telecom Wavelengths in Position-Controlled InP Nanowires: The Role of the Photonic Waveguide
- 4 April 2018
- journal article
- research article
- Published by American Chemical Society (ACS) in Nano Letters
- Vol. 18 (5), 3047-3052
- https://doi.org/10.1021/acs.nanolett.8b00550
Abstract
We report on the site-selected growth of bright single InAsP quantum dots embedded within InP photonic nanowire waveguides emitting at telecom wavelengths. We demonstrate a dramatic dependence of the emission rate on both the emission wavelength and the nanowire diameter. With an appropriately designed waveguide, tailored to the emission wavelength of the dot, an increase in the count rate by nearly 2 orders of magnitude (0.4 to 35 kcps) is obtained for quantum dots emitting in the telecom O-band, showing high single-photon purity with multiphoton emission probabilities down to 2%. Using emission-wavelength-optimized waveguides, we demonstrate bright, narrow-line-width emission from single InAsP quantum dots with an unprecedented tuning range of 880 to 1550 nm. These results pave the way toward efficient single-photon sources at telecom wavelengths using deterministically grown InAsP/InP nanowire quantum dots.Funding Information
- Vetenskapsr?det (638-2013-7152)
- H2020 Marie Sklodowska-Curie Actions (661416)
- FP7 Ideas: European Research Council (307687)
- Dr. Isolde-Dietrich-Stiftung
- Linn?centrum i Avancerad Optik och Fotonik, Kungliga Tekniska H?gskolan
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