Nonlinear Dynamics of Mesoscopic Systems under Laser Irradiation

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Studying on the physics under nonequilibrium open condition is important for understanding the real world from space to living organisms. Thus, the goal of our study is to build up experimental systems on the scale of micrometer to milimeter in which nonequilibrium open condition is achieved by the focused laser beam and to understand the mechanism. We have designed the experimental model systems where the object is trapped with a focused laser beam and, on the other hand, nonequilibrium condition is achieved by the energy of laser beam, i.e., photon. We have also made the theoretical modeling and numerical calculations, and we have achieved the following results :*A periodic change in the structure of a macromolecule / a lipid tube under the continuous laser irradiation.*Dynamical phase separation on the scale of micrometer induced by laser irradiation.*Rhythmic generation and disappearance of a droplet under laser irradiation*Control of spontaneous motion of a droplet by controlling the position of a laser beamIn addition, we have studied a spontaneous motion driven by the gradient of chemical energy in order to compare it with the phenomena with laser irradiation and achieved the following result.*Spontaneous motion of an oil droplet on a glass substrate in surfactant aqueous solution*Spontaneous motion of an alcohol droplet in a water-alcohol system*Spontaneous motion of a BZ reaction dropletThese systems can be regarded as a nonequilibrium open systems which is retained by the energy flow with laser irradiation or chemical energy gradient. We have described these systems with nonlinear differential equations, and have built up a new scenario for the spatio-temporal self organization in the nonequilibrium open systems.