Nanoantenna array-induced fluorescence enhancement and reduced lifetimes

Reuben M. Bakker, Vladimir P. Drachev, Zhengtong Liu, Hsiao Kuan Yuan, Rasmus H. Pedersen, Alexandra Boltasseva, Jiji Chen, Joseph Irudayaraj, Alexander V. Kildishev, Vladimir M. Shalaev

Research output: Contribution to journalArticlepeer-review

111 Citations (Scopus)


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.

Original languageEnglish
Article number125022
JournalNew Journal of Physics
Publication statusPublished - 16 Dec 2008
Externally publishedYes


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