Strain-induced Birefringence Control in Optical Planar Waveguides

摘要

For the first time, analytical formula of thermal-induced strain is derived for the waveguide glass layer in bi-layer structures, based on general theory of elastic interactions in multilayer structure for the thin film approximation under strain compatibility condition that includes the composite nature of the waveguide glass layer. This formula reveals how material and structural parameters affect the distribution of the thermal-induced strain in the whole waveguide glass layer. Using the formula, one can control the strain, and hence the induced birefringence within the waveguide devices.