Nonlinear temporal dynamics in multifunctional nanoantenna with asymmetry

A new concept of a nonlinear nanoantenna with multiple functions is suggested. We give theoretical research on the temporal dynamics for this asymmetric system which consistis of a pair of graphene-wrapped dielectric nanoparticles with tunable Fermi energies. It is demonstrated that asymmetry can lead to an enlarged stationary multistable regime and enrich the temporal dynamical behaviors compared to the symmetry counterpart. Such a nanoantenna can provide a chance to switch among coexisting nonlinear states under the illumination of a sequence of external pulses, which simultaneously leads to not only the manipulation of the angular scanning sector and scattering pattern of nanoantenna but also the controllable multistate optical switching or coding element. This kind of asymmetric dimer system may represent a possible step toward the development of tunable applications in nonlinear nanophotonics and biophotonics.