Travelling wave amplification in stationary gratings
- URL: http://arxiv.org/abs/2402.07486v1
- Date: Mon, 12 Feb 2024 08:52:03 GMT
- Title: Travelling wave amplification in stationary gratings
- Authors: S. A. R. Horsley and J. B. Pendry
- Abstract summary: 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.
This structure reproduces the key features of travelling gratings: amplification of a wave at points where the local wave speed equals the grating velocity.
- Score: 0.0
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: 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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