Аннотация:The parametric interaction of electromagnetic waves in a
medium with a negative index of refraction is considered. Two cases
of Kerr and quadratic nonlinearities are investigated. The
properties of nonlinear coupler, channels of which made of material
with opposing signs of refraction index, are studied. Dynamics of
extremely short pulses in the homogeneous doubly-resonant medium is
analyzed in the framework of Maxwell-Duffing-Lorentz model. The
new type of quasi-solitons is presented.