- Self-similar gold-nanoparticle antennas for a cascaded enhancement of the optical field.
Self-similar gold-nanoparticle antennas for a cascaded enhancement of the optical field.
Physical review letters (2012-10-04)
Christiane Höppener, Zachary J Lapin, Palash Bharadwaj, Lukas Novotny
PMID23031130
ABSTRACT
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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