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21 February 2011 Electrically pumped photonic nanowire single-photon source with an efficiency of 89%
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We propose a new electrically-pumped single-photon source design based on a quantum dot in a photonic nanowire. For realistic parameters, the design features an efficiency of 89 % predicted by numerical simulations. Unlike cavity-based designs, our approach allows for broadband spontaneous emission control and has high tolerance towards surface roughness. In the nanowire, a geometrical effect ensures good coupling between the quantum dot and the optical mode, and an inverted tapering section is introduced to adiabatically expand the mode waist and control the far field emission profile while minimizing the relative modal overlap with the metal contacts.
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Niels Gregersen, Torben Roland Nielsen, Jesper Mørk, Julien Claudon, and Jean-Michel Gérard "Electrically pumped photonic nanowire single-photon source with an efficiency of 89%", Proc. SPIE 7933, Physics and Simulation of Optoelectronic Devices XIX, 79331X (21 February 2011);

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