For N>2 closely spaced spherical resonators, the leading-order resonant frequencies and mode shapes are given explicitly for chain, ring, and matrix arrangements via the eigenvalues of simple Toeplitz or circulant matrices.
High-order exceptional points and enhanced sensing in subwavelength resonator arrays
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Resonant frequencies distribution for multiple closely spaced subwavelength resonators
For N>2 closely spaced spherical resonators, the leading-order resonant frequencies and mode shapes are given explicitly for chain, ring, and matrix arrangements via the eigenvalues of simple Toeplitz or circulant matrices.