Direct-write laser-induced self-organization and metallization beyond the focal volume in tellurite glass

We report on a self-organized process initiated potassium-tungsten-tellurite glass surface under repetitive femtosecond laser irradiation in regime where cumulative effects lead to localized melting. Specifically, we show that periodic patterns consisting of parallel nanoplanes perpendicular the polarization are forming and extending beyond zone direct exposure. Examination modified regions revealed phase change from glassy tellurium-oxide crystalline tellurium. In addition, observe this self-organization process, associated with elemental redistribution deoxygenation, is triggered by optical-field strength. suggest early nanostructures formed local-field enhancement subsequently reinforced metallization event an open-air atmosphere.