Supersymmetric (SUSY) transformations that originated in quantum physics and were recently adapted to photonics, offer a robust, physics-based approach to designing photonic structures such as optical filters, gratings, and lasers. On the other hand, second-order supersymmetry (2-SUSY) facilitates the engineering of quantum wells in order to optimize second-order nonlinear interactions. In this talk, we discuss a number of linear and nonlinear photonic structures designed using the 2-SUSY. In particular, we demonstrate the design of strongly enhanced second-order nonlinear optical susceptibilities in quantum wells that are being fabricated using digitally graded alloys.
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