Periodic surface structures frozen into CO2 laser-melted quartz

Ripple formation on laser-treated surfaces is studied in the infrared Reststrahlen region of quartz. We observe, for the first time, a dispersive behaviour of the ripple period. Thus we are led to a new explanation of the ripples: they represent holographic recordings of propagating electromagnetic surface waves (surface polaritons). Basic to this effect is a — hitherto not described — interference between a plane and an inhomogeneous wave, offering new possibilities for surface polariton physics.

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