Research And Application Of Single Micro-ring Resonator With Diamond Or Graphene

In recent years,photonic devices have gradually evolved into integration and miniaturization.As the typical application of photonic devices,the development of optical waveguide device is a key link to achieve this goal.Such as the large-scale integrated circuits integrated on the chip to achieve miniaturization in the field of electricity,the optical system is gradually integrating different optical signal processing components on one chip,thereby forming a novel optical waveguide device to realize various functions.The optical micro-ring resonator is one of the optical components,and has the advantages of simple structure,high quality factor,small size and easy integration,and thus can reduce the design cost of the optical fiber communication system.The most important thing is that the micro-ring resonator can be used to implement various functions such as filters,lasers,wavelength division multiplexers,electro-optic modulators and sensors via changing the structure and materials.Due to its powerful function,micro-ring resonators have become an important research topic in the development of integrated optics in recent years.Therefore,through studying the basic theory of micro-ring resonators and changing the micro-ring structure as well as materials,a diamond-based multilayer waveguide microring resonator and a graphene-based U-shaped microring electro-optic modulator are designed.The main work of this paper is as follows:(1)Under the research background of the subject,the development and research status of micro-ring resonators are introduced first,then the application fields are also demonstrated.After that,the basic principle of single micro-ring resonator is expounded.And according to the coupled mode theory,the transmission matrix is established,we have emphatically analyzed the transmission characteristics of single-micro-ring resonators with two configurations of TBOR-shaped waveguide and U-shaped waveguide,which includes their resonant wavelength,free spectral range,full width at half maximum,quality factor,extinction ratio and other characteristic parameters.And the production process was explained at last.Finally,The paper provides a theoretical basis for the subsequent design and research of new micro-ring resonators and their applications.(2)Based on the above theory,a micro-ring resonator with diamond core layer is designed.The longitudinal section of the design adopts a multi-layer waveguide structure.By analyzing the characteristics of diamond,the structural model is established,then we analyzed the transmission characteristics of the designed structure,also calculated the parameters such as the quality factor,ultimately the best design parameters are obtained.The proposal structure can not only expand the application of diamond in the field of optics,but also provide some guiding significance for the development of optical integrated chips.(3)According to the theory of micro-ring resonator and electro-optic modulator,we designed two kinds of single micro-ring electro-optic modulators based on double-layered graphene with single output and double output respectively.The use of graphene with double-layer has improved modulation precision,and the introduction of insulating material with a higher refractive index in the insulating layer between the two layers of graphene can further reduce the voltage value required for modulation.For the single output modulator,the U-shaped micro-ring structure greatly increases its free spectral range and extinction ratio.For the dual output modulator,this design can achieve a single input and dual output function well;with the TBOR type structure,its modulation performance is greatly improved;and both outputs can achieve low insertion loss,high crosstalk;And most importantly,it can be matched with low voltage CMOS technology.The design of these two graphene electro-optic modulators not only expands the application of graphene in the field of optics but also provides an important theoretical reference for the development of large-scale integrated optoelectronic communication devices.