The stress anisotropy in planar germanosilicate waveguides is used to follow the changes in stress, measured as a birefringence, with UV irradiation. Compressive stress increases with the growth of the negative index grating, saturating when the grating modulation saturates.
© 1999 Optical Society of America
J. Canning and M. Åslund, "Correlation of ultraviolet-induced stress changes and negative index growth in type IIa germanosilicate waveguide gratings," Opt. Lett. 24, 463-465 (1999)