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The second-order nonlinear susceptibility of asymmetric type-II quantum well is predicted to be strongly enhanced by the large interband electric dipole moment in type-II structures as compared with that in asymmetric type-I quantum well designs. The practical lattice-matched InGaAlAs/InP materials system is used to calculate the nonlinear susceptibility enhancement of the type-II band alignment.
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Zheng Ju, Stephen Schaefer, Jacob Khurgin, Yong-Hang Zhang, "Enhanced second-order nonlinear susceptibility in asymmetric type-II quantum well," Proc. SPIE PC12405, Nonlinear Frequency Generation and Conversion: Materials and Devices XXII, PC124050U (17 March 2023); https://doi.org/10.1117/12.2647759