Second?Order Optical Response in Electrically Polarized Sodo?Niobate Amorphous Thin Films: Particularity of Multilayer Systems

Herein, our attention is focused on the second-order optical properties of thermally poled sodo-niobate amorphous thin films through an original methodology that combines both macroscopic and microscopic second harmonic generation techniques. By probing geometry magnitude nonlinear (SONL) response at different scales, a key aspect film's poling mechanisms compared with bulk glasses demonstrated lies in appearance charge accumulation film/substrate interface described by Maxwell–Wagner effect. A way to minimize this effect then proven promoting induced built-in static field plane film using microstructured electrode. SONL susceptibility as high 29 pm V?1 measured its location are controlled micrometer scale; it constitutes improvement least one order other inorganic materials comparable lithium niobate single crystal.