Two types of topological singularity in a one-dimensional ABCBA photonic crystal give first-order, mixed second-order, radial second-order, and radial fourth-order differential imaging, including in the deep subwavelength regime.
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Multiple-order differential imaging based on two types of topological singularity in one dimensional photonic crystals
Two types of topological singularity in a one-dimensional ABCBA photonic crystal give first-order, mixed second-order, radial second-order, and radial fourth-order differential imaging, including in the deep subwavelength regime.