Controlling the emission profile of a nanowire with a conical taper

Niels Gregersen, Torben Roland Nielsen, J. Claudon, Jean Michel Gerard, Jesper Mørk

    Research output: Contribution to journalJournal articleResearchpeer-review


    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.
    Original languageEnglish
    JournalOptics Letters
    Issue number15
    Pages (from-to)1693-1695
    Publication statusPublished - 1 Aug 2008


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