Study On Electromagnetically Induced Transparency Effect And Sensing Characteristics Of Optical Microcavity With Slot Wave-guide Structure

As a new micro-nano integrated photon device,micro-ring resonator,composed of optical wave-guide,has the advantages of high sensitivity,high integration,simple structure for design and optimizing.It has become a popular direction of optical communication.With the development of fabrication technology of optical wave-guide devices,micro-ring resonators are widely used in optical filter,optical sensor,optical switch and optical storage.The improvement of structure and inserting new optical devices in the basic micro-ring resonator can effectively improve the optical performance and expand the application fields of the system.In this paper,we demonstrate and calculate the micro-ring resonator's optical performance.Then,we use the slot wave-guide to replace the strip wave-guide and add multiple ring resonators to produce mutual coupling.Next,we introduce the grating and two-dimensional material graphene to improve the structural design of micro-ring resonator to obtain better optical transmission characteristics and realize optical modulation and optical sensing functions.We use the optical simulation software to simulate the actual light transmission process in the device which verifies the theoretical design results.The main contents including:In the first chapter,we mainly introduce the micro-ring resonator's head-stream,classification,research significance and development status.Taking grating and graphene as examples,we introduce the design and application of micro-ring resonator combined with other photon devices,which provides ideas and innovations for the subsequent research of different structures and characteristics of micro-ring resonator.In the second chapter,we introduce the theoretical basis and research methods of micro-ring resonators.Based on Maxwell equations and coupled mode theory,we construct the working principle of micro-ring resonator.We illustrate the key parameters to judge the performance of micro-ring resonator.We explain the algorithm theory of numerical calculation and simulation used in the design of the device to increase the reliability of the research work.In the third chapter,we analyze the grating slot micro-ring resonator and demonstrate the optical transmission characteristics of the Bragg grating.The microring resonator can realize the phenomenon of electromagnetic induction transparency-like under the condition of single ring by using grating's optical reflection property.The influence on the transmission spectrum from the change of the key parameters of the grating is summarized by simulation and realize the optical modulation function.In the forth chapter,we analyze the cascaded micro-ring coupling resonator.We solve the optical transmission mode under the boundary condition of the slot waveguide and obtain the optical field distribution of the slot wave-guide.By the transmission matrix method,we obtain the optical transmission characteristics of the system.We demonstrate the pressure acoustic and solid mechanical characteristics of the device and obtain the deformation under the action of ultrasonic.We calculate the optical transmission spectrum of the system accordingly the relationship with ultrasonic and realize the function of acoustic sensor.In the fifth chapter,we analyze the graphene slot cascaded micro-ring resonator.We demonstrate the light absorption characteristics of graphene and establish the theoretical model of graphene wave-guide coupling,obtaining the influence of graphene placed in the ring cavity wave-guide on the light transmission of the system.We summary the changing of the graphene's characteristic parameters which means that we obtain the corresponding changes of the transmission spectrum of the system,realizing the optical modulation function.Moreover,we find the resonance wavelength changing when graphene placed in different rings.We obtain the sensing characteristics of the system by placing the system in the environment of the medium to be measured.In the last chapter,we introduce the conclusion and characteristics of the device propesed in this paper,summarize and prospect the research work...