Abstract
We report on experimental preparation and investigation of hidden wave modes, which represent stable patterns that cannot be attained by a monotonic variation of a control parameter starting from any other stable, non-hidden state. In terms of a stability diagram this situation may occur if the stability region of patterns is bent in such a way that secondary instabilities of neighboring, non-hidden states cannot lead to hidden patterns. Hidden patterns are prepared by driving the system at the frequency of the hidden state and by choosing an appropriate control parameter. Then these states may remain in the hidden state after disconnecting the driving force. The spatio-temporal dynamics of the hidden patterns is found to be more complicated than non-hidden, regular patterns. In particular, saturated long-wavelength modulation and non-linear wave-wave interaction can be observed.
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