Journal
NANO LETTERS
Volume 13, Issue 2, Pages 786-792Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl304523v
Keywords
Plasmonics; photoluminescence; optical sensor; efficiency; radiative engineering; plasmon decay
Categories
Funding
- U.S. Army Natick Soldier Research, Development, and Engineering Center
- SMART Scholarship Program. NSRDEC PAO [U12-550]
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By systematically investigating the light emission and scattering properties of arrays of Au nanoparticles with varying size and separation, we demonstrate tunability and control of metal photoluminescence and unveil the critical role of near-field plasmonic coupling for the engineering of active metal nanostructures. We show that the decay of photoexcited electron-hole pairs into localized surface plasmons (LSPs) dramatically modifies the Au emission wavelength, line shape, and quantum efficiency depending both on particles size and separation. In particular, in arrays with near-field coupled nanoparticles we demonstrate broad light scattering and emission spectra that scale differently with respect to nanoparticle size due to the enhanced LSP nonradiative decay caused by near-field interparticle coupling. Our experimental results are fully supported by semianalytical extinction simulations based on rigorous coupled wave analysis, which demonstrate the importance of tuning plasmonic near-field coupling for the engineering of active devices based on light emitting arrays of metallic nanoparticles.
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