ABSTRACT
Interesting theoretical and practical radiation and scattering effects
associated with passive and active core-shell nanoparticles (NPs)
have been investigated and will be reviewed. Both plane wave and
elementary Hertzian dipole excitations and a variety of gain media
have been examined. Optimal configurations at visible wavelengths
have been determined. Examples will illustrate how one can
engineer these nano-scatterers to have cross-sections significantly
larger than their geometrical size and how the corresponding nano-
antenna structures can be matched to local quantum emitters to act
as nano-amplifiers that significantly enhance the far-field responses.
On the contrary, it will be shown how they can also be designed to
actively jam these sources.
