Hannover 2013 – wissenschaftliches Programm

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

Q: Fachverband Quantenoptik und Photonik

Q 54: Quantum information: Photons and nonclassical light I

Q 54.3: Vortrag

Donnerstag, 21. März 2013, 14:45–15:00, E 001

Near-Unity Collection Efficiency of Single Photons from a Solid-State Emitter — Thomas J.K. Brenner, •Xiao-Liu Chu, Stephan Götzinger, and Vahid Sandoghdar — Max Planck Institut für die Physik des Lichts, Erlangen, Germany

Recently, we described a theoretical method for constructing a planar metallo-dielectric antenna that exhibits 99% collection efficiency. The antenna design consists of a multilayer architecture with stepwise change in the refractive index across the structure. Single photons emitted by a quantum emitter sandwiched in between the high and low refractive index layers are channeled into the middle layer (n2), from where they leak down into the high refractive index substrate (sapphire, n1=1.78) at angles determined by arcsin(n2/n1). The emitted photons are then collected by using a conventional microscope objective. Here we report on the experimental realization of this proposal using single colloidal quantum dots (CdS/CdSe) as sources of single photons. This system serves as a stable and ultra-bright source of single photons that is highly desirable for a variety of applications such as quantum communication, quantum cryptography, shot-noise-free detection and spectroscopy.