On Uma KheowanSupichai KantrasiriChananate UthaisarVilmos GáspárStefan C. MüllerMahidol UniversityDebreceni Egyetem Termeszettudomanyi es Technologiai KarOtto von Guericke University of Magdeburg2018-07-242018-07-242004-05-01Chemical Physics Letters. Vol.389, No.1-3 (2004), 140-144000926142-s2.0-1942541466https://repository.li.mahidol.ac.th/handle/20.500.14594/21280Spiral waves rotating rigidly in a thin layer of the light-sensitive Belousov-Zhabotinsky (BZ) reaction are subjected to a time-dependent uniform illumination. A non-local feedback algorithm computes the illumination intensity to be proportional to the average wave activity within a square-shaped sensory domain. The investigations show a broad spectrum of dynamical responses which results in square- and cross-shaped trajectories of the spiral tip, including reflections at the virtual walls. The geometry of the sensory domain is crucial in determining size and shape of the tip trajectories. A theoretical approach is proposed to explain the observed phenomena. © 2004 Elsevier B.V. All rights reserved.Mahidol UniversityChemistryPhysics and AstronomyArticleSCOPUS10.1016/j.cplett.2004.03.077