Nonlinear Optics with Backward Waves

Abstract

AbstractExtraordinary properties of nonlinear optical propagation processes in double-domain positive/negative index metamaterials are reviewed. These processes enable coherent energy exchange between ordinary and backward electromagnetic waves, which allows huge increase of frequency-conversion efficiency at second harmonic generation, three-wave mixing and optical parametric amplification. Striking contrasts with properties of the counterparts in ordinary materials are outlined. Particularly, exotic features arise for amplification and generation of counter-propagating short pulses. Novel class of materials, which enable such processes through electromagnetic waves with negative group velocity, are proposed. The possibility to mimic such processes in readily available crystals that support elastic backward waves (optical phonons) is shown. The concepts of unique photonic devices such as data processing chips, tunable nonlinear-optical mirrors, filters, switches and sensors are discussed.KeywordsStimulate Raman ScatteringSlab ThicknessStokes WaveFundamental RadiationFundamental PulseThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.