DPG Phi
Verhandlungen
Verhandlungen
DPG

Berlin 2018 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

HL: Fachverband Halbleiterphysik

HL 16: Focussed Session: Quantum Nanophotonics in Solid State Systems: Status, Challenges and Perspectives I (joint session HL/TT)

HL 16.11: 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 shellMathieu Jeannin1, Thibault Cremel2, Teppo Häyrynen3, •Niels Gregersen3, Edith Bellet-Amalric2, Gilles Nogues1, and Kuntheak Kheng21Université 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.

100% | Mobil-Ansicht | English Version | Kontakt/Impressum/Datenschutz
DPG-Physik > DPG-Verhandlungen > 2018 > Berlin