Spontaneous emission enhancement of quantum dots in a photonic crystal wire.
Photonic wires are the simplest extended low-dimensional systems. Photonic crystal confinement confers them a divergent density of states at zero-group-velocity points, which leads to enhancement of spontaneous emission rates [D. Kleppner, Phys. Rev. Lett. 47, 233 (1981)10.1103/Phys. Rev. Lett. 47.233]. We experimentally evidence, for the first time, the spectral signature of these Purcell factor singularities, using the out-of-plane emission of InAs quantum dots buried in GaAs/AlGaAs based photonic crystal based wire. Additionally, in-plane collection at the wire exit shows large enhancements of the signal at some of the density of states singularities.
Viasnoff-Schwoob
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Laboratoire PMC, Ecole Polytechnique, 91128 Palaiseau, France.
Weisbuch
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Benisty
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Olivier
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Varoutsis
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Robert-Philip
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Houdré
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Smith
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