Nonlinear media whose permittivity ε can be reduced to nearly zero allow an additional enhancement of a nonlinear optical response. It is commonly accepted that the cubic nonlinearity is enhanced at a certain wavelength λENZ if Reε(λENZ) = 0. It is shown in this work that the enhancement of the nonlinear refractive index n2 generally occurs at a different wavelength \(\lambda {\kern 1pt} '\). This anomalous shift is manifested when the wavelength λENZ of a material is near the resonance of the nonlinear susceptibility. An analytical condition for the enhancement of the nondegenerate optical Kerr effect is obtained.
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ACKNOWLEDGMENTS
We are grateful to Prof. A.I. Fishman (Kazan Federal University) for valuable remarks.
Funding
This work was supported by the Russian Science Foundation, project no. 19-12-00066. A.V. Kharitonov, who performed analytical calculations, acknowledges the support of the Ministry of Science and Higher Education of the Russian Federation (project no. 0671-2020-0050, state task in the field of scientific activity at Kazan Federal University).
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Kharitonov, A.V., Gazizov, A.R. & Kharintsev, S.S. Enhancement of the Cubic Nonlinearity in Epsilon-Near-Zero Media: Nondegenerate Optical Kerr Effect. Jetp Lett. 114, 687–692 (2021). https://doi.org/10.1134/S0021364021230077
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DOI: https://doi.org/10.1134/S0021364021230077