Photosensitivity of As2S3 chalcogenide thin films at 1.5 microm |
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Authors: | Hô Nicolas Laniel Jacques M Vallée Réal Villeneuve Alain |
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Institution: | Centre d'Optique Photonique et Laser, Université Laval, Quebec G1K7P4, Canada. |
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Abstract: | Chalcogenide glasses are promising candidates for all-optical switching and various nonlinear applications. However, we show that As2S3 thin films are photosensitive at wavelengths in the 1.5-microm telecommunication window. This sensitivity is evidenced by the formation of self-written waveguides in slabs, where channels as narrow as 1 microm 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. |
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