Nonlinear Photo-Diffusion in Amorphous Chalcogenide Multilayers
Enhanced intermixing, induced by a laser beam, has been recently observed in amorphous Se/As2S3 and similar multilayers. We report a model, based on the concept of thermal spikes, which can consistently describe experimental observations. The concentration dependence of the light absorption properties causes the photo-stimulated diffusion to be non-linear even when a concentration independent coefficient of thermo-stimulated diffusion is assumed.
M. Danielewski, R. Filipek, R. Kozubski, W. Kucza, P. Zieba, Z. Zurek
I. Iván et al., "Nonlinear Photo-Diffusion in Amorphous Chalcogenide Multilayers", Defect and Diffusion Forum, Vols. 237-240, pp. 1210-1215, 2005