Analysis Of Two-dimensional Photoniccrystal Ring Cavity Waveguide

AbstractAfter the concept of the photonic crystals was proposed in the eighty’s of the last century, because of its photonic band gap and local characteristics of photon, this special structure quickly became the hot topics in the study of scientific research personnel. In the 21 st century, the photonic crystals in many fields such as communication, medical treatment have been applied, so the research of photonic crystal is vigorously promoted and supported by our country. In this background, this paper puts forward the double loop coupling of two-dimensional photonic crystal ring cavity waveguide structure and analyzes its column cavity medium influence on transmission characteristics, in the meanwhile gradient structure to improve the Q value of the two-dimensional photonic crystal ring cavity waveguide is introduced by this paper.In this paper FDTD algorithm and the plane wave expansion method are the experiment simulations applied to the proposed double coupled with two-dimensional circular photonic crystal waveguide cavity structure. The influence of coupled column, inner column, scattering column in the double loop coupling two-dimensional circular photonic crystal waveguide cavity structure to the transfer characteristics is analyzed by RSOFT experiment simulation.The increase of coupling column layers in two-dimensional circular photonic crystal waveguide reduces the coupling efficiency so that results in the decrease of transmission wave transmission rate. The increase of the radius of the annular cavity scattering column removes multiple models in the process of transmission in the two-dimensional circular photonic crystal waveguide cavity. The increase of scattering column refractive index or inner cylinder radius results in the increase of light wave peak diffuse in the two-dimensional circular photonic crystal waveguide. The increase of refractive index of inner cylinder not only results in the increase of light wave peak diffuse in the two-dimensional circular photonic crystal waveguide, but also reduces the wavelength of the peak light. The Q value will be increased if the gradient structure is introduced into the waveguide. Therefore, in this paper two-dimensional circular photonic crystal waveguide cavity structure with high Q value and high transmittance is proposed.