Improve the Effective Resonance Light Scattering of Three-Layered Plasmonic Au@Dielectric@Ag Bimetallic Nanoshells

The strong light scattering from SPR has received an extraordinary attention due to the useful applications in photodetectors and cell biomedical imaging. However, using require a high cross-section along with low absorption losses near resonance wavelength. In this paper, effective plasmonic of three-layered Au–Ag bimetallic nanoshells dielectric separate layer been studied quasi-static approximation classical electrodynamics. Because surface plasmon (SPR)-induced intense absorption, intensity is much weaker than that cross-section. could be improved by tuning geometric dimension local environment nanostructure. It found greatest takes place when outer Ag nanoshell thick thickness or small constant. also depends on inner Au sphere radius surrounding mode transformation SPR, greatly very large size. changes non-monotonously as constant increases. obtained intermediate value. This tunable Au@Ag presents potential for design fabrication optical nanodevice based scattering.