Abstract:Kagome lattice defect modes with a point-ring structure are explored theoretically in two-dimensional germanium cylinder photonic crystals using plane wave expansion and supercell methods. The number and degeneracy of the transverse magnetic field defect mode are governed by the defect setting. By varying the distance and direction of the point-ring defects, we can manipulate and control the frequency width and coupling between defect modes and the defect frequency in the bandgap. Additionally, the intensity d… Show more
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