A ultra-narrow-band optical filter based on zero refractive index metamaterial

Due to the photonic band gap effect and defect state effect, Photonic metamaterials have received strong attention in design of narrow bandpass filters, which are key devices optical communication equipment such as wavelength division multiplexing devices. In this paper, based on zero-index (ZIM), a compact filter with both high peak transmission coefficient ultra-narrow bandwidth is proposed. metamaterial conical dispersions Dirac-like point achieved by optimizing structure material component parameters dielectric rods square lattice air. It has been demonstrated that triply degenerate can be realized at point, relate media effective permittivity permeability equal zero simultaneously. Electromagnetic (EM) wave propagate without any phase delay frequency, dispersion occurs adjacent frequency cone, leading dramatic changes properties. We explore introducing ZIM into compress realization filter. The embedded resonant cavity line filter, also composed order increase sensitivity change adjusted match study spectrum COMSOL Multiphysics simulation software, it found width half-maximum decreases thickness increase, transmittance still well when greatly compressed. inside slab observed. Through field distribution analysis, zero-phase coupling characteristics electromagnetic observed frequency. As comparison conventional discussed. believe work helpful investigating filters.