Exact fundamental limits of the first and second hyperpolarizabilities

Abstract

This letter calculates the exact fundamental limits of the first (β) and second (γ) hyperpolarizabilities using Monte-Carlo sampling of energy spectra and transition moments constrained by the diagonal Thomas-Reiche-Kuhn (TRK) sum rules and filtered by the off-diagonal TRK sum rules. The upper bounds of β and γ are determined from these quantities by applying error-refined extrapolation to perfect compliance to the sum rules. The method yields the largest diagonal component of the hyperpolarizabilities for an arbitrary number of interacting electrons in any number of dimensions without the necessity for exotic interactions or unconventional spectra. The results show that the fundamental limits agree with those achieved by potential optimization and direct solution of mechanical Hamiltonians, about 30% (40%) below original estimates of the limits for β (γ), and show that the special cases that lead to divergent nonlinearities in the many-state catastrophe are not physically realizable. Thus, this letter shows for the first time that the fundamental limits are rigorously exact and are achievable without exotic material designs.

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Cited by in corpus (4)

• Using excited states and degeneracies to enhance the electric polarizability and first hyperpolarizability
• A Normalized Descriptor for Unbiased Screening of Second-Order Nonlinear Optical Materials
• Homotopy analysis method applied to second-order frequency mixing in nonlinear optical dielectric media
• Topological control of the nonlinear-optical response of hybrid quantum systems