  Material characteristics and input-field specifics limit the controllability
of nonlinear electromagnetic-field interactions. As these nonlinear
interactions could be exploited to create strongly localized bright and dark
waves, such as nonlinear surface polaritons, ameliorating this limitation is
important. We present our approach to amelioration, which is based on a
surface-polaritonic waveguide reconfiguration that enables excitation,
propagation and coherent control of coupled dark rogue waves having orthogonal
polarizations. Our control mechanism is achieved by finely tuning laser-field
intensities and their respective detuning at the interface between the atomic
medium and the metamaterial layer. In particular, we utilize controllable
electromagnetically induced transparency (EIT) windows commensurate with
surface-polaritonic polarization-modulation instability to create symmetric and
asymmetric polaritonic frequency combs associated with dark localized waves.
Our method takes advantage of an atomic self-defocusing nonlinearity and dark
rogue-wave propagation to obtain a sufficient condition for generating phase
singularities. Underpinning this method is our theory which incorporates
dissipation and dispersion due to the atomic medium being coupled to nonlinear
surface-polaritonic waves~(SPWs). Consequently, our waveguide configuration
acts as a bimodal polaritonic frequency-comb generator and a high-speed phase
rotator, thereby opening prospects for phase singularities in nanophotonic and
quantum communication devices.
