Novel Patterns and Chaotic Dynamics of Surface Waves
Collaborators: Jerry Gollub, Arshad Kudrolli, Mathew Abraham
Former collaborators: T. Besson, B. Pier, S. Edwards
Two frequency forcing
The form of the forcing waveform does not have to be sinusoidal. It
may be any periodic waveform. When two frequencies are mixed, a
richer set of patterns are observed. Quasi-crystalline patterns are
obtained when the forcing frequencies are such that one component is
an even multiple and the other an odd multiple of a base frequency.
These patterns have twelvefold orientational order, but only
quasiperiodic translational order. Patterns containing a hexagonal
superlattice are also obtained by changing the proportion of one
component with respect to the other. These experiments were initiated
by Benoit Pier and Stuart Edwards, and have been continued recently
by Arshad Kudrolli and Mathew Abraham.
Example of a quasipattern
Example of a hexagonal superlattice
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Last modified on 11/19/96.