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Control of radiative processes using tunable plasmonic nanopatch antennas.

dc.contributor.author Ciracì, Dr Cristian
dc.contributor.author Hoang, TB
dc.contributor.author McGuire, F
dc.contributor.author Mikkelsen, MH
dc.contributor.author Mock, JJ
dc.contributor.author Rose, A
dc.contributor.author Smith, David R
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.identifier http://www.ncbi.nlm.nih.gov/pubmed/25020029
dc.identifier.uri http://hdl.handle.net/10161/9254
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.language eng
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
dc.identifier.eissn 1530-6992


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