Resonances in small scatterers with impedance boundary

Abstract

With analytical (generalized Mie scattering) and numerical (integral-equation-based) considerations we show the existence of strong resonances in the scattering response of small spheres with lossless impedance boundary. With increasing size, these multipolar resonances are damped and shifted with respect to the magnitude of the surface impedance. The electric-type resonances are inductive and magnetic ones capacitive. Interestingly, these subwavelength resonances resemble plasmonic resonances in small negative-permittivity scatterers and dielectric resonances in small high-permittivity scatterers. The fundamental dipolar mode is also analyzed from the point of view of surface currents and the effect of the change of the shape into a non-spherical geometry.

References in corpus (3)

• Dyadic Green's Functions and Guided Surface Waves for a Surface Conductivity Model of Graphene
• Localized plasmons in graphene-coated nanospheres
• Unveiling the scattering behavior of small spheres

Cited by in corpus (4)

• Electromagnetic modes and resonances of two-dimensional bodies
• A quantum emitter coated with graphene interacting in the strong coupling regime
• Angular-Momentum Selectivity and Asymmetry in Highly Confined Wave Propagation Along Sheath-Helical Metasurface Tubes
• Scattering Properties of Spherical Time-Varying Conductive Shells