stationary gratings 中的 Travelling wave amplification
Travelling wave amplification in stationary gratings
AI总结：
本文将空间静止但时间振荡的 grating 建模为对向 travelling 的独立 gratings，揭示其在波速匹配点实现 wave amplification 与光子产生，且比 travelling gratings 更易实验实现。
摘要：
我们表明，空间上静止但时间上振荡的 grating 可以被精确建模为一组沿相反方向 travelling 的独立 gratings，它们几乎只与同方向 travelling 的波发生相互作用。该结构再现了 travelling gratings 的关键特征：在局部波速等于 grating 速度的点处实现波的 amplification。当 grating profile 的单一 Fourier component 速度与局部波速匹配时，同样会出现场压缩与光子产生。我们推测，这些静止但振荡的 gratings 可能比 travelling gratings 更易于在实验中实现。
英文摘要：
We show that a grating amplitude stationary in space but oscillating in time can be accurately modelled as a set of independent gratings travelling in opposite directions, interacting almost exclusively with waves travelling in the same direction. This structure reproduces the key features of travelling gratings: amplification of a wave at points where the local wave speed equals the grating velocity. The same field compression and photon production is evident when even a single Fourier component of the grating profile has a velocity that matches the local wave speed. We speculate that these stationary but oscillating gratings may prove easier to realise experimentally than travelling gratings.
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