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= Figet Spinner =

A Figet Spinner is a mechanical instrument used to repair the crystal structure of thin liquid films. The name is derived from the latin word figet (reapir).

The working principle is closely related to conventional spin coaters. Here, a flat surface mounting a substrate roatetes around its center at frequencies up to 10,000 rpm. A drop of liquid is placed in the center of the substrate so that centrifugal force spreads the liquid evenly across the surface.

For a Figet Spinner, the rotational movement is additionally moduluated with a low amplitude supersonic signal (Frequency modulation). In liquids with a crystaline substructure (eg Liquid crystal), the supersonic motion causes a random re-orientation of the local crystal structure. The random orientation allows for energy minimization which then in turn leads to a decrease in crystallographic defects.

The method was proposed by Moritz Ophaus in 2017 and used to optimise the fabrication of birefringent materials for nonlinear microscopy.