This paper reports the optical response of an asymmetric plasmonic nanoshell placed near a fluorescent molecule by considering radiation damping, because unlike conventional symmetric nanoshells, asymmetric nanoshells have an extra degree of tunability and controllability. The optical absorption cross-section of an asymmetric plasmonic metal nanoshell known as a nanoegg, in which the core is offset concerning the shell center, and a three-layer asymmetric nanoshell with two core and outer shell offsets is investigated and compared. We demonstrate how a reduced-symmetry metal nanoshell affects fluorescence quenching of a molecule, which refers to a process that decreases the fluorescence intensity of the molecule. In addition, the asymmetry effect of a plasmonic nanoshell on the fluorescence lifetime is also investigated.
Daneshfar et al. (Mon,) studied this question.