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• W3090938963 abstract "We discuss a quartic eigenvalue problem arising in the context of an optical waveguiding problem involving atomically thick 2D materials. The waveguide configuration we consider consists of a gradient-index (spatially dependent) dielectric equipped with conducting interior interfaces. This leads to a quartic eigenvalue problem with mixed transverse electric and transverse magnetic modes, and strongly coupled electric and magnetic fields. We derive a weak formulation of the quartic eigenvalue problem and introduce a numerical solver based on a quadratification approach in which the quartic eigenvalue problem is transformed to a spectrally equivalent companion problem. We verify our numerical framework against analytical solutions for prototypical geometries. As a practical example, we demonstrate how an improved quality factor (defined by the ratio of the real and the imaginary part of the computed eigenvalues) can be obtained for a family of gradient-index host materials with internal conducting interfaces. We outline how this result lays the groundwork for solving related shape optimization problems." @default.
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• W3090938963 date "2020-12-01" @default.
• W3090938963 modified "2023-10-02" @default.
• W3090938963 title "Nonlinear eigenvalue problems for coupled Helmholtz equations modeling gradient-index graphene waveguides" @default.
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• W3090938963 doi "https://doi.org/10.1016/j.jcp.2020.109871" @default.
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