Whispering gallery mode resonances in thermally poled borosilicate glass optical microcavities

Three-dimensional control in the tuning of the linear and nonlinear properties of optical materials can catalyse the design of new photonic devices. Glasses being the backbone materials for drawing optical fibres, are inherently centrosymmetric, so their nonlinear dielectric susceptibility χ (2) is zero; thermal poling has been used for breaking the symmetry of such amorphous matrixes [1] .