Single-mirror feedback systems
A conceptually particularly simple scheme which already forms optical
patterns consists of a thin slice of a nonlinear medium and a distant plane
reflector ( d´Alessandro
1991). During the propagation of the transmitted beam to the mirror
and back, different points in the transverse plane are coupled by diffraction.
Diffraction also converts phase in amplitude modulation which in turn can
change the refractive index of the nonlinear medium and thus close the
feedback loop (click here for a more detailed
description of the mechanism of the instability). The wavelength of the
pattern to emerge scales with the square root of the cell to mirror distance
This scale can be explained by the Talbot-effect.
Current projects in optical pattern formation are
List of publications