Characteristics of photonic crystal band gap
Selecting different lattice structures can produce different forbidden band widths and positions; different dielectric constants and filling ratios are proportional to the forbidden band width within a certain range; under the same filling ratio, different column shapes are studied, and elliptical columns are found The structure of the body is not much different from the structure of the cylinder, but its TE and TM modes have multiple discrete forbidden bands compared with the cylindrical structure. The structure of the forbidden band has changed greatly, and the actual processing produces photonic crystals. Due to insufficient accuracy, the cylindrical structure is often destroyed and becomes an ellipse or other shapes, so the cylindrical structure of the photonic crystal is of great importance in the analysis of the photonic band gap.