Solid-state single photon sources: the nanowire antenna.
Opt Express
; 17(4): 2095-110, 2009 Feb 16.
Article
em En
| MEDLINE
| ID: mdl-19219114
ABSTRACT
We design several single-photon-sources based on the emission of a quantum dot embedded in a semiconductor (GaAs) nanowire. Through various taper designs, we engineer the nanowire ends to realize efficient metallic-dielectric mirrors and to reduce the divergence of the far-field radiation diagram. Using fully-vectorial calculations and a comprehensive Fabry-Perot model, we show that various realistic nanowire geometries may act as nanoantennas (volume of approximately 0.05 lambda(3)) that assist funnelling the emitted photons into a single monomode channel. Typically, very high extraction efficiencies above 90% are predicted for a collection optics with a numerical aperture NA=0.85. In addition, since no frequency-selective effect is used in our design, this large efficiency is achieved over a remarkably broad spectral range, Deltalambda=70 nm at lambda=950 nm.
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Base de dados:
MEDLINE
Assunto principal:
Refratometria
/
Nanotecnologia
/
Pontos Quânticos
/
Nanoestruturas
/
Lasers
Tipo de estudo:
Prognostic_studies
Idioma:
En
Ano de publicação:
2009
Tipo de documento:
Article