We report the creation of microchannels in a photosensitive material, the arsenic trisulfide As<sub>2</sub>S<sub>3</sub>. We show that microchannels are created through the process of self-writing and are highly sensitive to the photosensitivity of the material as well as the quality of the incident wave front. The very high photosensitivity of As<sub>2</sub>S<sub>3</sub> allows the self-written waveguide to become much smaller than the incident beam. We present a numerical analysis based on the nonlinear Schrödinger equation that accounts well for the diversity of the microchannels that were experimentally observed and shows that they can actually guide light.
© 2002 Optical Society of America
Nicolas Hô, Jacques M. Laniel, Réal Vallée, and Alain Villeneuve, "Creation of microchannels in a photosensitive As2S3 slab waveguide," J. Opt. Soc. Am. B 19, 875-880 (2002)