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Decoupling absorption and emission processes in super-resolution localization of emitters in a plasmonic hotspot

Author

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  • David L. Mack

    (The Blackett Laboratory, Imperial College London)

  • Emiliano Cortés

    (The Blackett Laboratory, Imperial College London)

  • Vincenzo Giannini

    (The Blackett Laboratory, Imperial College London)

  • Peter Török

    (The Blackett Laboratory, Imperial College London)

  • Tyler Roschuk

    (The Blackett Laboratory, Imperial College London)

  • Stefan A. Maier

    (The Blackett Laboratory, Imperial College London)

Abstract

The absorption process of an emitter close to a plasmonic antenna is enhanced due to strong local electromagnetic (EM) fields. The emission, if resonant with the plasmonic system, re-radiates to the far-field by coupling with the antenna via plasmonic states, whose presence increases the local density of states. Far-field collection of the emission of single molecules close to plasmonic antennas, therefore, provides mixed information of both the local EM field strength and the local density of states. Moreover, super-resolution localizations from these emission-coupled events do not report the real position of the molecules. Here we propose using a fluorescent molecule with a large Stokes shift in order to spectrally decouple the emission from the plasmonic system, leaving the absorption strongly resonant with the antenna’s enhanced EM fields. We demonstrate that this technique provides an effective way of mapping the EM field or the local density of states with nanometre spatial resolution.

Suggested Citation

  • David L. Mack & Emiliano Cortés & Vincenzo Giannini & Peter Török & Tyler Roschuk & Stefan A. Maier, 2017. "Decoupling absorption and emission processes in super-resolution localization of emitters in a plasmonic hotspot," Nature Communications, Nature, vol. 8(1), pages 1-10, April.
    • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_ncomms14513
    DOI: 10.1038/ncomms14513
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