Figure 1. Mie scattering from nanostructures.

(a) Schematic illustration of light scattering from core-shell nanostructures. Near-field profiles for scattered fields of (b) resonant and (c) non-resonant regimes. In the resonant regime, light is confined within the nanowire and scatters under leaky mode behavior. However, for low-refractive indices, light cannot be trapped inside nanowires and is instead scattered immediately in the forward direction, passing directly through the structure. (d–e) Using finite difference time domain (FDTD) method, a gradual transition from resonant to non-resonant Mie scattering regimes can be observed by reducing the refractive index of the nanostructure core. While changes between the modes of TE and TM polarizations are observed in higher refractive indices, scattering maps are nearly identical for the low refractive index medium for both polarization types.