Reuben M Bakker et al 2008 New J. Phys. 10 125022 doi:10.1088/1367-2630/10/12/125022
Nanoantenna array-induced fluorescence enhancement and reduced lifetimes
Focus on PlasmonicsReuben M Bakker1, Vladimir P Drachev1, Zhengtong Liu1, Hsiao-Kuan Yuan1, Rasmus H Pedersen2, Alexandra Boltasseva1,3, Jiji Chen4, Joseph Irudayaraj4, Alexander V Kildishev1 and Vladimir M Shalaev1,5
Show affiliationsPart of Focus on Plasmonics
Enhanced fluorescence is observed from dye molecules interacting with optical nanoantenna arrays. Elliptical gold dimers form individual nanoantennae with tunable plasmon resonances depending upon the geometry of the two particles and the size of the gap between them. A fluorescent dye, Rhodamine 800, is uniformly embedded in a dielectric host that coats the nanoantennae. The nanoantennae act to enhance the dye absorption. In turn, emission from the dye drives the plasmon resonance of the antennae; the nanoantennae act to enhance the fluorescence signal and change the angular distribution of emission. These effects depend upon the overlap of the plasmon resonance with the excitation wavelength and the fluorescence emission band. A decreased fluorescence lifetime is observed along with highly polarized emission that displays the characteristics of the nanoantenna's dipole mode. Being able to engineer the emission of the dye–nanoantenna system is important for future device applications in both bio-sensing and nanoscale optoelectronic integration.
- PACS
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78.55.Kz Solid organic materials
78.66.Qn Polymers; organic compounds
84.40.Ba Antennas: theory, components and accessories
78.67.-n Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures
- Subjects
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Soft matter, liquids and polymers
Condensed matter: electrical, magnetic and optical
- Dates
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Issue 12 (December 2008)
Received 21 May 2008
Published 16 December 2008
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Nanoantenna array-induced fluorescence enhancement and reduced lifetimes
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