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We show that ghost waves—a special class of nonuniform waves in biaxial dielectric media—can lead to exact frequency degeneracies in guided modes. These degeneracies offer a new way of controlling mode interactions with a broad range of potential applications, from integrated waveguides to nonlinear optics and optical sensing.

We show the recently discovered ghost waves, a special class of non-uniform waves in biaxial anisotropic media, can offer a new approach to optical sensing, that employs simple planar geometry and low-cost dielectric materials, and provides a high figure of merit for sensor performance.

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