Figure 1

Scattering properties of a single-layered core-shell nanoparticle.

(a) Geometry of a core-shell nanostructure and associated coordinate system. The incident plane wave is polarized along the x-direction and propagates along the z-direction. The scattered light is specified by the scattering angle θ and the azimuthal angle φ. The silver core has a radius of R_in = 53 nm. The dielectric shell has a refractive index of n = 2.0 and a thickness of t = 167 nm. [Note: The graph is drawn by Zhuo Chen.] (b) Scattering spectra of the first three electric a₁, a₂, a₃ (solid curves) and the first three magnetic b₁, b₂, b₃ (dashed curves) multipolar contributions. Marked point S at the wavelength of λ = 906 nm indicates that the electric and magnetic dipole terms have equal coefficients (a₁ = b₁). (c) BS (olive curve) and FS (wine curve) efficiencies versus the incident wavelengths. Marked point B1, corresponding to the point S in (b), indicates a non-zero BS efficiency at the wavelength of λ = 906 nm. Marked point B2 indicates a zero BS efficiency at the wavelength of λ = 654 nm. (d) Real and imaginary parts of the Mie terms 3a₁ and 5a₂. (e) Real and imaginary parts of the dipole-related Mie term 3(a₁ − b₁) and the quadrupole-related term 5(a₂ − b₂). (f) 2D scattering patterns calculated at the wavelength of λ = 654 nm on the scattering planes of the azimuthal angles φ = 0° (red solid curve) and 90° (blue dashed curve).