Abstract.
Continued irradiation of smectic-C-like domains of photosensitive Langmuir monolayers from azobenzene derivatives induces the nucleation and propagation of orientational travelling waves as observed with Brewster angle microscopy (BAM). BAM image analysis has allowed to identify different dynamical behaviors involving the generation and propagation of such waves. A model based on the coupling between an orientational and a composition field proposes a scenario for dynamic self-assembly that accounts for most of the observed phenomena, and allows to pinpoint the relevance of boundary defects in wave-emitting structures.-1
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Electronic supplementary material
The movie
shows the photoalignment and onset of travelling waves in a Langmuir monolayer (see Fig. 1). The movie
Supplementary material
shows a set of primary and secondary waves nucleating upon sustained irradiation (see Fig. 2). The movie
shows a train of primary waves (see Fig. 3). The movie
shows sawtooth waves propagating downwards (see Fig. 5). The movie
Supplementary material
shows non-emitting boundary waving (see Fig. 6). The movie
shows numerical simulation of a non-emitting oscillating scenario (see Fig. 6). The movie
shows numerical simulation of the wave-emitting scenario. The director field and corresponding BAM image are shown on the left while the composition field is shown on the right (see Fig. 7).
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Claret, J., Crusats, J., Albalat, R. et al. Travelling waves in two-dimensional smectic-C domains. Eur. Phys. J. E 21, 111–116 (2006). https://doi.org/10.1140/epje/i2006-10049-5
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DOI: https://doi.org/10.1140/epje/i2006-10049-5