National Science Council of Taiwan Grant Number NSC 102-2745-M-002-005-ASP 102-2911-I-002-505 101-2911-I-002-107 100-2923-M-002-007-MY3 101-2112-M-002-023- 100-2112-M-019 -003 -MY3
Fluorescence spectroscopy, Luminescence spectroscopy, Optics -- Physical, Surface plasmon resonance
The modified fluorescence properties of a molecule in the vicinity of a metallic nanoparticle are further studied accounting for the possible existence of extraneous charges on the particle surface. This is achieved via a generalization of the previous theory of Bohren and Hunt for light scattering from a charged sphere, with the results applied to the calculation of the various decay rates and fluorescence yield of the admolecule. Numerical results show that while charge effects will in general blue-shift all the plasmonic resonances of the metal particle, both the quantum yield and the fluorescence yield can be increased at emission frequencies close to that of the surface plasmon resonance of the particle due to the suppression of the nonradiative decay rate. This provides a possibility of further enhancing the particle-induced molecular fluorescence via the addition of surface charge to the metal particle.
Chung, H., Leung, P., & Tsai, D. (2013). Molecular fluorescence in the vicinity of a charged metallic nanoparticle. Optics Express, 21(22), 26483-26492.