Journal
NANO LETTERS
Volume 10, Issue 7, Pages 2598-2603Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl101281a
Keywords
Localized surface plasmon resonance; metal nanoparticles; plasmon-enhanced emission; far-field scattering; fluorescence enhancement; photoluminescence lifetime
Categories
Funding
- Air Force Office of Scientific Research
- National Science Foundation [DMR 0520567]
- Research Corporation
- Alfred P Sloan Foundation
- Camille Dreyfus Teacher-Scholar Program
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The near-field effects of plasmonic optical antennas are being explored in applications ranging from biosensors to solar cells We demonstrate that photoluminescence emission enhancement from CdSe quantum dots (QDs) can be obtained in the absence of any excitation enhancement near single silver nanoprisms The spectral dependence of the radiative and nonradiative decay rate of the QDs closely follows the silver nanoparticle plasmon scattering spectrum Using both experiment and theory we show that, in the absence of excitation enhancement, the ratio of radiative to nonradiative decay rate enhancement is proportional to the silver nanoparticle scattering efficiency These results provide guidelines both for separating excitation and emission enhancement effects in sensing and device applications and for tailoring emission enhancement effects using plasmonic nanostructures
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