Investigation On Optical Characteristics Of The Microstructure System Based On Optical Resonance

Optical resonators are regarded as the basic elements of telecommunication system. Optical resonators, especially the micro-ring resonator and the photonic crystal defect cavity have great potential applications. In this paper, based on studying Micro-ring topological structures and photonic crystal, we design two structures: the double waveguide coupled micro-ring with feedback and the photonic crystal coupled cavities optical waveguide, and their optical properties and applications are discussed. The main contents of this paper can be divided into two parts:Firstly, we design a structure of double waveguide coupled micro-ring with feedback. The transfer matrix method is employed to derive the formulas of transmittance, phase shift and delay. According to the formulas, the filtering characteristics are analyzed. We obtain the best conditions of filtering properties and know that filtering properties of structure with feedback is better than the structure without feedback. Then we find that light switch can play by modulation loss or feedback loop via investigating the switching, delaying and mode compression characteristics. Furthermore, the structure can also be used as mode compression device.Secondly, we analyze the general criteria of dynamic stopping light in photonic crystal. We introduce the square lattice photonic crystal coupled cavities optical waveguide which is got by internally changing the radii of the central line dielectric cylinder. Using Plane Wave Expansion Method, we conclude that the resonance frequency of the cavity varies with the dielectric cylinder radius and refractive index, and we optimize this coupling resonance optical waveguide basing upon the conclusion above. Through the Bloch theory and coupled-mode theory, it indicates that the waveguide can freely modulate pulse group velocity by dynamic modulating refractive index or radii of the dielectric cylinder. The light pulse can be stopped when refractive index or radii of the dielectric cylinder reduced to a certain degree.