Ultrafast Room-Temperature Single Photon Emission from Quantum Dots Coupled to Plasmonic Nanocavities

TitleUltrafast Room-Temperature Single Photon Emission from Quantum Dots Coupled to Plasmonic Nanocavities
Publication TypeJournal Article
Year of Publication2016
AuthorsT..B. Hoang, G..M. Akselrod, M..H. Mikkelsen
JournalNano Letters
Volume16
Issue1
Pagination270 - 275
Date PublishedJan-01-2017
ISSN1530-6984
Abstract

Efficient and bright single photon sources at room temperature are critical components for quantum information systems such as quantum key distribution, quantum state teleportation, and quantum computation. However, the intrinsic radiative lifetime of quantum emitters is typically ∼10 ns, which severely limits the maximum single photon emission rate and thus entanglement rates. Here, we demonstrate the regime of ultrafast spontaneous emission (∼10 ps) from a single quantum emitter coupled to a plasmonic nanocavity at room temperature. The nanocavity integrated with a single colloidal semiconductor quantum dot produces a 540-fold decrease in the emission lifetime and a simultaneous 1900-fold increase in the total emission intensity. At the same time, the nanocavity acts as a highly efficient optical antenna directing the emission into a single lobe normal to the surface. This plasmonic platform is a versatile geometry into which a variety of other quantum emitters, such as crystal color centers, can be integrated for directional, room-temperature single photon emission rates exceeding 80 GHz.

URLhttp://pubs.acs.org/doi/abs/10.1021/acs.nanolett.5b03724
DOI10.1021/acs.nanolett.5b03724
Short TitleNano Lett.