Computing Cut-off Wavelengths from Dispersion Characteristics for 2D Triangular Photonic Crystal Based Superlens

Cut-off wavelengths for first five bands are analytically evaluated from dispersion characteristics for photonic crystal based superlens. 2D PhC with triangular geometry is considered for simulation purpose where plane wave expansion method is utilized, and both TE and TM modes are taken into account for estimation. Different material compositions are applied with air to investigate the effect of varying dielectric constant cut-off wavelengths. Contour diagrams indicates that results exhibit that most of the wavelengths fall in UV ranges, which speaks in favor of designing superlens with high-K materials.