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Epsilon-near-zero materials are a rapidly expanding field due to their enhanced light matter interaction. These materials have shown large changes in refractive index on the order of the linear index; however, this is associated with large absorption changes. Here we experimentally and theoretically show a method to mitigate the absorption changes in the film while doubling the refractive index modulation. Using beam deflection, a nonlinear technique to measure χ^((3)), individual excitation processes can be controlled in time and space on a film so the nonlinear refractive index change can double on a sample, while the absorption change can be nullified.
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Adam R. Ball, Ray Secondo, Dhruv Fomra, Vitaly Avrutin, Umit Ozgur, Nathaniel Kinsey, "Dual excitation beam deflection in nonlinear epsilon-near-zero materials," Proc. SPIE PC12228, Ultrafast Nonlinear Imaging and Spectroscopy X, PC122280J (3 October 2022); https://doi.org/10.1117/12.2632849