Self-Similar Gold-Nanoparticle Antennas for a Cascaded Enhancement of the Optical Field | Zendy

Christiane Höppener | Zendy; Zachary J. Lapin | Zendy; Palash Bharadwaj | Zendy; Lukáš Novotný | Zendy

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Self-Similar Gold-Nanoparticle Antennas for a Cascaded Enhancement of the Optical Field

Author(s) -

Christiane Höppener,

Zachary J. Lapin,

Palash Bharadwaj,

Lukáš Novotný

Publication year - 2012

Publication title -

physical review letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.688

H-Index - 673

eISSN - 1079-7114

pISSN - 0031-9007

DOI - 10.1103/physrevlett.109.017402

Subject(s) - materials science , colloidal gold , nanoparticle , field (mathematics) , optoelectronics , nanotechnology , optics , physics , mathematics , pure mathematics

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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