Abstract
We report polarization-insensitive epsilon-mu-near-zero (EMNZ) effect for both transverse-electric (TE) and transverse-magnetic (TM) polarizations in two types of two-dimensional (2D) annular PCs (APCs). The square-lattice air-ring (or dielectric-ring) type 2D APC can support non-accidental Dirac-like degeneracy for three low-energy TE (or TM) bands and accidental Dirac-like degeneracy for three higher-energy TM (or TE) bands at the same frequency. We rigorously demonstrate the polarization-insensitive EMNZ effect in 2D APCs based on the S-parameters inversion technique.
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