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Strong two-photon fluorescence enhanced jointly by dipolar and quadrupolar modes of a single plasmonic nanostructure

By T. Zhang, G. Lu, J. Liu, H. Shen, P. Perriat, M. Martini, O. Tillement and Q. Gong

Abstract

cited By 6International audienceA single gold nano-cylinder presenting multipolar plasmon resonances to enhance two-photon fluorescence is investigated employing three dimensional finite-difference time-domain method. Cylinders of large dimension usually display dipolar and quadrupolar plasmonic resonances. We demonstrate that the dipolar resonance can couple with the incident light resulting in a large localized field enhancement which increases the molecular excitation rate. At the same time, the radiative quadrupolar mode overlaps with the emission band of excited fluorophores to assist the fluorescence emission due to an enhancement in the quantum efficiency. Such dipole-quadrupole jointly enhanced two-photon fluorescence exhibits exceptionally promise in brighter label design. © 2012 American Institute of Physics

Topics: Finite difference time domain method, Cylinders (shapes), Fluorescence emission, Incident light, Label design, Large dimensions, Localized field, Molecular excitations, Plasmon resonances, Plasmonic, Plasmonic nanostructures, Two photon fluorescence, Finite-difference time-domain (FDTD) methods, Emission bands, Dipole-quadrupole, Fluorescence, Photons, Plasmons, Fluorophores, [SPI.MAT]Engineering Sciences [physics]/Materials
Publisher: 'AIP Publishing'
Year: 2012
DOI identifier: 10.1063/1.4742148
OAI identifier: oai:HAL:hal-01834926v1
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