Dipole-dipole interaction between molecules mediated by a chain of silver nanoparticles.
We study the dipole-dipole coupling between two fluorescent molecules in the presence of a chain of metallic nanoparticles. We analyze the spectral behavior of the coupling strength and its dependence on the molecular orientation. Our results show that for certain resonant wavelengths the coupling strength between the molecules is greatly enhanced and is strongly polarization sensitive. We also demonstrate how metallic nanoparticles can be utilized in implementing a polarization-sensitive coupler.
Lindberg
J
J
Department of Engineering Physics and Mathematics and Center for New Materials, Helsinki University ofTechnology (TKK), PO Box 3500, FI-02015 TKK, Finland. Jari.Lindberg@tkk.fi
Lindfors
K
K
Setälä
T
T
Kaivola
M
M