Second-Order Nonlinear Response in Centrosymmetric Hyperbolic Media

Published 22 May 2026 in physics.optics | (2605.24184v1)

Abstract: We show that centrosymmetric natural hyperbolic media such as hexagonal boron nitride exhibit a bulk second-order nonlinear response, leading to second-harmonic and sum- and difference-frequency generation with efficiencies comparable to those of established nonlinear optical crystals such as potassium dihydrogen phosphate.

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Evgenii E. Narimanov

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