普通和后向电磁波的树波混频：异常瞬变
Tree-wave mixing of ordinary and backward electromagnetic waves: extraordinary transients
摘要：
研究了脉冲状态下普通电磁波和后向电磁波在异向介质中的三波混频，这种异向介质可以实现普通电磁波和后向电磁波的共存和相位匹配。结果表明，在大幅度增强的光学参量放大和频率上、下移的非线性反射率中，后向波的相速度和能流方向相反会引起异常的瞬态过程。所发现的瞬态类似于振荡器在其共振附近对脉冲激励的缓慢响应
英文摘要：
Three-wave mixing of ordinary and backward electromagnetic waves in pulsed regime is investigated in the metamaterials, which enable co-existence and phase matching of such waves. It is shown that opposite direction of phase velocity and energy flux in backward waves gives rise to extraordinary transient processes in greatly enhanced optical parametric amplification and in frequency up or down shifting nonlinear reflectivity. The discovered transients resemble slowed response of an oscillator on pulsed excitation in the vicinity of its resonance
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