Chalcogenide glasses are promising candidates for all-optical switching and various nonlinear applications. However, we show that As<sub>2</sub>S<sub>3</sub> thin films are photosensitive at wavelengths in the 1.5-μm telecommunication window. This sensitivity is evidenced by the formation of self-written waveguides in slabs, where channels as narrow as 1μm are created. We also show the detrimental effects of such photosensitivity in ridge waveguides. This photosensitivity seems to occur only in thin-film form and not in bulk samples or fibers.
© 2003 Optical Society of America
Nicolas Hô, Jacques M. Laniel, RĆal Vallée, and Alain Villeneuve, "Photosensitivity of As2S3 chalcogenide thin films at 1.5 μm," Opt. Lett. 28, 965-967 (2003)