Strong photosensitivity in tin-doped silica films
The observation is reported of a strong negative change in the refractive index of tin-doped thin silica films deposited by helicon activated reactive evaporation. Samples with concentrations between 5 and 25 mol% SnO2 were exposed to 2kJ/cm2 of 248 nm UV radiation. Negative refractive index changes as large as -2.7 × 10-3 were observed on irradiation.
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