Large UV-induced negative index changes in germanium-freenitrogen-doped planar SiO 2 waveguides
- 19 February 1998
- journal article
- Published by Institution of Engineering and Technology (IET) in Electronics Letters
- Vol. 34 (4) , 364-366
- https://doi.org/10.1049/el:19980288
Abstract
Negative refractive index changes of up to 1.7 × 10–3 have been induced by 248 nm excimer laser light in planar germanium-free SiON waveguides. Highly temperature-stable 40 dB Bragg gratings with a length of 8 mm have been written. A novel mechanism of photosensitisation was used to create the high-index changes.Keywords
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