Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 39: Focus Session: Quantum Nanophotonics in Solid State Systems I (joint session HL/TT)
TT 39.11: Vortrag
Dienstag, 13. März 2018, 13:00–13:15, EW 201
Enhanced single-photon emission from a CdSe quantum dot in a ZnSe nanowire featuring a bottom-up photonic shell — Mathieu Jeannin1, Thibault Cremel2, Teppo Häyrynen3, •Niels Gregersen3, Edith Bellet-Amalric2, Gilles Nogues1, and Kuntheak Kheng2 — 1Université Grenoble Alpes, CNRS, Institut Néel, Grenoble, France — 2Université Grenoble Alpes, CEA, Grenoble, France — 3DTU Fotonik, Technical University of Denmark, Kongens Lyngby, Denmark
A quantum dot in a semiconductor nanowire represents an attractive platform for an efficient single-photon source. While demonstrations so far have mainly been for III-V materials, the II-VI platform offers the possibility of room-temperature operation, where CdSe quantum dots inserted in ZnSe nanowires have demonstrated the ability to emit single photons at 300 K.
In this work, we present a bottom-up approach to fabricate a photonic nanowire-like structure around such CdSe quantum dots by depositing an oxide shell using atomic-layer deposition. Simulations suggest that the intensity collected in a 0.6 NA microscope objective can be increased by a factor 7 with respect to the bare nanowire case. Combining micro-photoluminescence, decay time measurements, and numerical simulations, we obtain a fourfold increase in the collected photoluminescence from the quantum dot. We show that this improvement is due to an increase of the quantum-dot emission rate and a redirection of the emitted light.