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Recently,inwardly propagating waves (called antiwaves,AWs) in nonlinear oscillatory systems have attractedmuch attention.An interesting negative refraction phenomenon has been observed in a bidomain system whereone medium supports forwardly propagating waves (normal waves,NWs) and the other AWs.In this paper we findthat negative refraction (NR) in nonlinear media has an asymmetric property,i.e.,NR can be observed only by applyingwave source with proper frequency to one medium,but not the other.Moreover,NR appears always when the incidentwaves are dense and the refractional waves are sparse.This asymmetry is a particular feature for nonlinear NR,whichcan neither be observed in linear refraction processes (both positive and negative refractions) nor in nonlinear positiverefraction.The mechanism underlying the asymmetry of nonlinear NR are fully understood based on the competitionof nonlinear waves
Recently, inwardly propagating waves (called antiwaves, AWs) in nonlinear oscillatory systems have attractedmuch attention. An interesting negative refraction phenomenon has been observed in a bidomain system whereone medium supports forwardly propagating waves (normal waves, NWs) and the other AWs.In this paper we findthat negative refraction (NR) in nonlinear media has an asymmetric property, ie, NR can be observed only by applyingwave source with proper frequency to one medium, but not the other .Moreover, NR appears always when the incidentwaves are dense and the refractional waves are sparse. This asymmetry is a particular feature for nonlinear NR, which can not be observed in linear refraction processes (both positive and negative refractions) nor in nonlinear positive refraction. The mechanism underlying the asymmetry of nonlinear NR are fully understood based on the competition of nonlinear waves