We study theoretically the light scattering from trimers of metal nanowires, with emphasis on the occurrence of multiple surface-plasmon resonances, showing that such resonances can be exploited to achieve twofold-enhanced fluorescence from a single molecule placed in the nanotrimer gaps, even if excitation and emission frequencies are separated. Pump enhancement stems from the local field enhancement coinciding with one of the resonances, whereas a strong enhancement of the radiative decay rate (and quantum yield) is revealed at a different resonance, leading to a large overall signal emission.
© 2008 Optical Society of America
Original Manuscript: December 14, 2007
Revised Manuscript: February 19, 2008
Manuscript Accepted: February 24, 2008
Published: April 21, 2008
Vol. 3, Iss. 6 Virtual Journal for Biomedical Optics
V. Giannini and J. A. Sánchez-Gil, "Excitation and emission enhancement of single molecule fluorescence through multiple surface-plasmon resonances on metal trimer nanoantennas," Opt. Lett. 33, 899-901 (2008)