Nonlinear Optics in Spatially Negatively Dispersive Metamaterials: Extraordinary and Counterintuitive

Abstract : Extraordinary frequency-converting nonlinear-optical propagation processes associated with backward electromagnetic and elastic waves are reviewed. Particular realizations of negative spatial dispersion which enable such waves are discussed. OUTLINE * NIMs and BEMWs.* Coherent NLO; exotic properties of energy exchange between ordinary and backward EM waves: greatly enhanced harmonic generation, frequency-mixing and optical parametric amplification.* Spatial dispersion and BEMWs: phase matching of ordinary and backward EM waves in the carbon nanoforest: short pulses double back, tailoring pulse shapes.* Backward-wave optical phonons and enhanced fs SRS.