Open AccessSurface plasmon enhancement effect in molecular excitation
Author(s) -
Sun Xue-Fei,
Luxia Wang
Publication year - 2014
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.63.097301
Subject(s) - excitation , plasmon , surface plasmon , dipole , discrete dipole approximation , materials science , polarization (electrochemistry) , electric field , localized surface plasmon , molecular physics , atomic physics , particle (ecology) , molecule , physics , optoelectronics , chemistry , quantum mechanics , oceanography , geology
Enhancement effect of surface plasmon in the metal nano-particle is a hot topic in nano-material field. A system is investigated where a spherical metal nano-particle is placed near a dye molecule. Under the optical excitation of a polarized electric field the subsequent charge transfer dynamics for different relative positions are simulated by density matrix theory approach, where the Coulomb interaction of molecule and metal nano-particle is calculated in the framework of the dipole-dipole approximation. It is found that the enhancement effect is closely related to the relative distance between the molecule and metal nano-particle. Effect of enhancement due to the surface plasmon is discussed in detail for various coupling interactions, polarization of field, lifetime of plasmon, and non-resonant excitation; and the physical essence in the molecule-metal nano-particle coupled system is analysed.