Negative index gratings in planar germanosilicate waveguides were found to be stable up to 500 °C. The annealing properties are similar to those of negative index fiber gratings.
© 1998 Optical Society of America
M. Åslund, J. Canning, and M. Bazylenko, "High-temperature stable gratings in germanosilicate planar waveguides," Opt. Lett. 23, 1898-1900 (1998)