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Sketch of the photonic crystal. Unit-cell size is represented a and the radius of internal structures of the photonic crystal is chosen as 0.2a. The regions of NIM (vacuum) are colored in green (white). The permittivity and the permeability are chosen in ɛ = −5.9 and μ = −0.4 (ɛ = μ = 1) in the green- (white-) colored region.
