Study On The Slow Optical Properties Of Photonic Crystal Slab Waveguide

At present,the era we are in belongs to the era of optical communication.Optical communication relying on photoelectric conversion technology is limited by conversion efficiency and integration scale.In all-optical communication,in order to make efficient use of optical information,people need to make the light slow Down,that is to produce slow light,there are currently several ways to produce slow light: electromagnetically induced transparent technology,coherent layout technology,stimulated Brillouin scattering,stimulated Raman scattering,but these methods have their own limitations,electromagnetic Induced transparency technology has extremely high requirements on experimental equipment and can only be carried out in low temperature and low pressure environments.Coherent layout technology has strict frequency requirements and can only be carried out at specific frequencies,while stimulated Brillouin scattering and stimulated Raman scattering Current research is limited to fiber optic applications.In summary,due to the limitation of the experimental environment,the above-mentioned methods for generating slow light require high cost,and are not easy to be integrated in a small scale,so that they are applied on a large scale.Since the concept of photonic crystals was put forward,with the deepening of research,it was found that photonic crystals can produce slow light at room temperature,and slow light technology will play a great role in all-optical communication networks in the future.In all-optical communication,the key technology is optical buffering,and the study of the slow light characteristics of photonic crystal waveguides provides new ideas for implementing optical buffering.This article takes flat photonic crystals as the research object,the main contents are as follows:1.Analyze the basic theory of photonic crystals and the research progress of slow light technology at home and abroad2.Describes the numerical analysis method of photonic crystals in detail,from Maxwell's equations to eigen equations,and introduces several other analysis methods for the limitations of this method;analyzes several technical methods that can produce slow light,and Analyzed their respective advantages and limitations.3.Start with a simple two-dimensional photonic crystal,perform energy band analysis and optimize the photonic crystal structure,design the photonic crystal slab waveguide structure of this paper,analyze its slow light characteristics through its dispersion curve,and then extend to the periodic cladding slab The photonic crystal waveguide extends the air hole to the cladding range,and analyzes the numerical values of different defect hole radii(0.1*a,0.2*a,0.25*a,0.3*a,0.35*a)and the radii of the adjacent air holes(0.3*a,0.35*a,0.45*a,0.5*a)the effect of changes on slow light.