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Title
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Control of surface plasmon resonances in dielectrically-coated proximate gold nanoparticles immobilized on a substrate
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Type
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JournalPaper
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Keywords
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optical-plasmon resonance, gold-nanoparticle , optical waveguides,discrete-dipole approximation
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Abstract
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We present experimental and theoretical results for the changes in the optical-plasmon resonance of gold-nanoparticle dimers immobilized on a surface when coated with an organic, dielectric material. The plasmon band of a nanoparticle dimer shifts to a higher wavelength when the distance between neighboring particles is decreased, and a well-separated second peak appears. This phenomenon is called cross-talk. We find that an organic coating lets cross-talk start at larger separation distances than for uncoated dimers by bridging the gap between immobilized nanoparticles (creating optical clusters). We study this optical clustering effect as a function of the polarization of the applied light, of the inter-particle distance, of the surrounding environment, and of the optical properties of the coating layer. Theoretical discrete-dipole approximation calculations support the experimental absorption spectroscopy results of gold nanoparticles on glass substrates and on optical waveguides
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Researchers
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Silvia Mittler (Not In First Six Researchers), Chitra Rangan (Not In First Six Researchers), Volker Bohmer (Not In First Six Researchers), Ganna Podoprygorina (Not In First Six Researchers), Abdollah Hassanzadeh (Fifth Researcher), Touraj Manifar (Fourth Researcher), Songbo Xu (Third Researcher), Asad Rezaee (Second Researcher), Patric Rooney (First Researcher)
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