关键词: 表面等离激元共振, 单分子荧光, 近场增益, 弛豫系数变化

Abstract: The authors theoretically investigated the fluorescence enhancement of single molecules near the resonant silver nano-antenna. The optimal fluorescence effect occurs at the large optimal coefficient, defined by the ratio between the normalized near field and decay rate. It shows that when the polarization of dipoles is parallel to the polarization of incident field and the dipoles are located within the specific nanoregion of 30-100 nm away from the metallic surface, a large fluorescence enhancement is achieved. For the different polarazition of dipoles, the enhancement effects of emission are also discussed at different location of dipoles and different incident wavelength. The results are helpful in the experiment design of single molecular fluorescence near the plasmonic nano-antenna.

Key words: surface plasmon, single molecular fluorescence, near field enhancement, modified decay rates