Control of radiative processes using tunable plasmonic nanopatch antennas.

dc.contributor.author

Rose, Alec

dc.contributor.author

Hoang, Thang B

dc.contributor.author

McGuire, Felicia

dc.contributor.author

Mock, Jack J

dc.contributor.author

Ciracì, Cristian

dc.contributor.author

Smith, David R

dc.contributor.author

Mikkelsen, Maiken H

dc.coverage.spatial

United States

dc.date.accessioned

2014-11-08T03:11:45Z

dc.date.accessioned

2014-11-08T03:14:19Z

dc.date.issued

2014-08-13

dc.description.abstract

The radiative processes associated with fluorophores and other radiating systems can be profoundly modified by their interaction with nanoplasmonic structures. Extreme electromagnetic environments can be created in plasmonic nanostructures or nanocavities, such as within the nanoscale gap region between two plasmonic nanoparticles, where the illuminating optical fields and the density of radiating modes are dramatically enhanced relative to vacuum. Unraveling the various mechanisms present in such coupled systems, and their impact on spontaneous emission and other radiative phenomena, however, requires a suitably reliable and precise means of tuning the plasmon resonance of the nanostructure while simultaneously preserving the electromagnetic characteristics of the enhancement region. Here, we achieve this control using a plasmonic platform consisting of colloidally synthesized nanocubes electromagnetically coupled to a metallic film. Each nanocube resembles a nanoscale patch antenna (or nanopatch) whose plasmon resonance can be changed independent of its local field enhancement. By varying the size of the nanopatch, we tune the plasmonic resonance by ∼ 200 nm, encompassing the excitation, absorption, and emission spectra corresponding to Cy5 fluorophores embedded within the gap region between nanopatch and film. By sweeping the plasmon resonance but keeping the field enhancements roughly fixed, we demonstrate fluorescence enhancements exceeding a factor of 30,000 with detector-limited enhancements of the spontaneous emission rate by a factor of 74. The experiments are supported by finite-element simulations that reveal design rules for optimized fluorescence enhancement or large Purcell factors.

dc.identifier

http://www.ncbi.nlm.nih.gov/pubmed/25020029

dc.identifier.eissn

1530-6992

dc.identifier.uri

https://hdl.handle.net/10161/9254

dc.language

eng

dc.publisher

American Chemical Society (ACS)

dc.relation.ispartof

Nano Lett

dc.relation.isversionof

10.1021/nl501976f

dc.relation.replaces

http://hdl.handle.net/10161/9253

dc.relation.replaces

10161/9253

dc.title

Control of radiative processes using tunable plasmonic nanopatch antennas.

dc.type

Journal article

pubs.author-url

http://www.ncbi.nlm.nih.gov/pubmed/25020029

pubs.begin-page

4797

pubs.end-page

4802

pubs.issue

8

pubs.organisational-group

Duke

pubs.organisational-group

Electrical and Computer Engineering

pubs.organisational-group

Pratt School of Engineering

pubs.publication-status

Published

pubs.volume

14

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