Photonic Crystal Slab Waveguide Design And Its Slow Light Characteristics Investigation

In current optical communication times,all-optical communication has becoming a research hotspot,and all-optical cache is one of the important technologies to realize all-optical communication.The slow light technology which slows down the speed of light lays an important foundation for the development of all-optical cache and all-optical information processing technology.Slow light means that the propagation speed of light in medium is less than that in vacuum.Slow light can strengthen the interaction between light and matter,so it is extensively used in optical communication,optical sensing and other related directions.Photonic crystal is a new type of structure defined by human beings.It is characterized by periodicity in structure.Since it was proposed,because of its small size,strong controllability,slow light can be produced at room temperature,and unique photonic band gap and local characteristics,it has shown great advantages in the field of slow light.Taking photonic crystal structure as the research target,this paper introduces the basic theory and numerical analysis method of photonic crystal,and expounds the concept of slow light and slow light mechanism of photonic crystal.The silicon photonic crystal waveguide and slot waveguide are designed.The slow light characteristics of the two waveguide structures are calculated and optimized.By adjusting the structure parameters of the two waveguide structures,the lower group velocity is gained.The main research contents of this paper are as follows1.The photonic crystal plate structure is designed by using Band SOLVE module in Rsoft software.By scanning its structural parameters and calculating and analyzing its band gap characteristics,the lattice type of photonic crystal slab structure is selected and determined as hexagonal lattice,the air hole radius is 0.453 a,and the slab thickness is 1.15 a.The mode of the complete photonic crystal slab structure is calculated by Fullzone method.2.Remove the air hole lead-in defects in the middle row of the slab structure to form the photonic crystal waveguide structure,and lead in the slot at the defect position to form the photonic crystal slot waveguide structure.The defect mode of the waveguide is calculated and analyzed,and the dispersion curve of the photonic crystal waveguide is obtained.3.Study slow light characteristics.The defect mode eigenvalue data of the dispersion curves of the two kinds of waveguide structures are studied and calculated respectively.By fine tuning the structure parameters such as the radius of the air hole on both sides of the waveguide structure defect and its position offset,slot width and so on,the photonic crystal slow light waveguide is designed,and the group velocity is 0.020 c and 0.016 c respectively.Through the research of this paper,the photonic crystal waveguide and slot waveguide structure are designed,and by adjusting the structural parameters of the waveguide,the lower group velocity is obtained.This paper has reference significance for the design and research of photonic crystal slow light waveguide.