Ultrafast modulation, switching and optical wave mixing are essential functionalities for various CMOS compatible photonic integrated circuits with applications for optical communication, signal processing and computing. We explore second and third order nonlinear susceptibilities of various inhomogeneous thin film compositions and characterize their properties using a Maker fringes setup and ultrashort femtosecond scale laser pulses. Specifically, we demonstrate enhanced effective second order nonlinear response by engineering the compositions to create a strong internal DC electric fields (~20 pm/V) as well as synthesizing silicon rich silicon nitride films with high second order nonlinear polarizability (~8 pm/V) in as grown films.
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