LARGE ABSOLUTE BAND-GAP SQUARE-LATTICE PHOTONIC CRYSTAL BASED ON CROSS-ROD CYLINDERS AND CIRCULAR CYLINDERS

摘要

Provided is a large absolute band-gap square-lattice photonic crystal based on cross-rod cylinders and circular cylinders, comprising a high-refractive-index medium cylinder and a low-refractive-index background medium cylinder. The high-refractive-index medium cylinder consists of a flat medium cylinder cross-rod connected to a circular medium cylinder, arranged in the direction of a cross; the cells of the photonic crystal structure are arranged according to the square lattice; the crystal constant of the square lattice is a; the width of the flat medium cylinder is 0.0558a, the external diameter of the cylinder is 0.31392a, and the relative value of the maximum absolute band gap is 17.26755%. The square lattice photonic crystal easily connects and couples different optical elements in an optical path, and different optical paths, facilitating reduced manufacturing costs; the photonic crystal structure has a large absolute band gap and is widely applicable to the design of large-scale integrated optical circuits.