Photo-induced refractive index change of amorphous tin-doped As_2S_8 films and its application to strip waveguide fabrication

摘要

The amorphous chalcogenide glass Sn_1As_(20)S_(79) is demonstrated to undergo permanent changes in refractive index on irradiation with ultraviolet light. The refractive properties of this material and the effect of annealing at temperatures below the glass transition temperature are investigated in detail. An Sn_1As_(20)S_(79) strip waveguide is fabricated using this photoinduced refractive index change, and the device is shown to function as expected with good propagation characteristics for the 632.8 nm guided mode.