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Controlling the emission profile of a nanowire with a conical taper

2008; Optica Publishing Group; Volume: 33; Issue: 15 Linguagem: Inglês

10.1364/ol.33.001693

1539-4794

Niels Gregersen, Torben Roland Nielsen, Julien Claudon, Jean‐Michel Gérard, Jesper Mørk,

Plasmonic and Surface Plasmon Research

The influence of a tapering on nanowire light-emission profiles is studied. We show that, for nanowires with divergent output beams, the introduction of a conical tapering with a small opening angle reduces the beam divergence and increases transmission. This results in a dramatic increase in the collection efficiency of the detection optics. For a realistic tapering and a modest NA, the collection efficiency is enhanced by more than a factor of 2. This improvement is ensured by the adiabatic expansion of the guided mode in the tapering.