PMID: 15244722Jul 13, 2004Paper

Dynamics of laser-induced electroconvection pulses

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
N C GiebinkC C Allen

Abstract

We first report that, for planar nematic 4-methoxy-benzilidene-4-butylaniline (MBBA), the electroconvection threshold voltage has a nonmonotonic temperature dependence, with a well-defined minimum, and a slope of about -0.12 V/degrees C near room temperature at 70 Hz. Motivated by this observation, we have designed an experiment in which a weak continuous-wave absorbed laser beam with a diameter comparable to the pattern wavelength generates a locally supercritical region, or pulse, in dye-doped MBBA. Working 10-20 % below the laser-free threshold voltage, we observe a steady-state pulse shaped as an ellipse with the semimajor axis oriented parallel to the nematic director, with a typical size of several wavelengths. The pulse is robust, persisting even when spatially extended rolls develop in the surrounding region, and displays rolls that counterpropagate along the director at frequencies of tenths of Hz, with the rolls on the left (right) side of the ellipse moving to the right (left). Systematic measurements of the sample-voltage dependence of the pulse amplitude, spatial extent, and frequency show a saturation or decrease when the control parameter (evaluated at the center of the pulse) approaches approximately 0.3. We pro...Continue Reading

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Citations

Apr 12, 2006·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Daniel R SpiegelSkyler R Saucedo
Oct 13, 2007·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Karen K Vardanyan, Daniel R Spiegel

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