Enhanced photon extraction from a nanowire quantum dot using a bottom-up photonic shell

Publication: Research - peer-reviewJournal article – Annual report year: 2017

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Semiconductor nanowires offer the possibility to grow high quality quantum dot heterostructures, and in particular CdSe quantum dots inserted in ZnSe nanowires have demonstrated the ability to emit single photons up to room temperature. In this letter, we demonstrate a bottom-up approach to fabricate a photonic fiber-like structure around such nanowire quantum dots by depositing an oxide shell using atomic layer deposition. We find that the intensity collected in our NA=0.6 microscope objective can be increased by a factor 7 with respect to the bare nanowire case. Combining microphotoluminescence, decay time measurements and numerical simulations, we show that this improvement 10 is due to an increase of the quantum dot emission rate and a redirection of the emitted light. Our ex-situ fabrication technique allows a precise and reproducible fabrication on a large scale. Its improved extraction efficiency is compared to state of the art top-down devices.
Original languageEnglish
JournalNano Letters
Number of pages19
StateSubmitted - 2017
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ID: 129466420