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Control of radiative processes using tunable plasmonic nanopatch antennas.
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.
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https://hdl.handle.net/10161/9254Published Version (Please cite this version)
10.1021/nl501976fPublication Info
Rose, Alec; Hoang, Thang B; McGuire, Felicia; Mock, Jack J; Ciracì, Cristian; Smith,
David R; & Mikkelsen, Maiken H (2014). Control of radiative processes using tunable plasmonic nanopatch antennas. Nano Lett, 14(8). pp. 4797-4802. 10.1021/nl501976f. Retrieved from https://hdl.handle.net/10161/9254.This is constructed from limited available data and may be imprecise. To cite this
article, please review & use the official citation provided by the journal.
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Show full item recordScholars@Duke
Maiken Mikkelsen
James N. and Elizabeth H. Barton Associate Professor of Electrical and Computer Engineering
Maiken H. Mikkelsen is the James N. and Elizabeth H. Barton Associate Professor of
Electrical and Computer Engineering at Duke University. She received her B.S. in Physics
from the University of Copenhagen in 2004, her Ph.D. in Physics from the University
of California, Santa Barbara in 2009 and was a postdoctoral fellow at the University
of California, Berkeley before joining Duke University in 2012. Her research explores
nanophotonics and new quantum materials to enable transformative break
David R. Smith
James B. Duke Distinguished Professor of Electrical and Computer Engineering
Dr. David R. Smith is currently the James B. Duke Professor of Electrical and Computer
Engineering Department at Duke University. He is also Director of the Center for Metamaterials
and Integrated Plasmonics at Duke and holds the positions of Adjunct Associate Professor
in the Physics Department at the University of California, San Diego, and Visiting
Professor of Physics at Imperial College, London. Dr. Smith received his Ph.D. in
1994 in Physics from the University of California, San D
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