Self-similar gold-nanoparticle antennas for a cascaded enhancement of the optical field.

نویسندگان

  • Christiane Höppener
  • Zachary J Lapin
  • Palash Bharadwaj
  • Lukas Novotny
چکیده

We experimentally demonstrate cascaded field enhancement by means of gold nanoparticle dimer and trimer antennas. The local field enhancement is probed by single-molecule fluorescence using fluorophores with high intrinsic quantum efficiency (Q(0)>80%). Using a self-similar trimer antenna consisting of 80, 40, and 20 nm gold nanoparticles, we demonstrate a fluorescence enhancement of 40 and a spatial confinement of 15 nm. Compared with a single gold nanoparticle, the self-similar trimer antenna improves the enhancement-confinement ratio by more than an order of magnitude. Self-similar antennas hold promise for high-resolution imaging and spectroscopy, ultrasensitive detection, and efficient single-photon sources.

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عنوان ژورنال:
  • Physical review letters

دوره 109 1  شماره 

صفحات  -

تاریخ انتشار 2012