| The research on the interaction of light and matter has always been a field of concern.In recent years,with people’s urgent needs for the application of micro-nano photonic devices and the increasing maturity of micro-nano processing technology,the research on the interaction of light and coherent medium in the micro-nano waveguide system has gradually developed into one of the most active branches in micro-nano optics.The electromagnetic field mode distribution in micro-nano waveguides is usually evanescent waves,that is,the electric field intensity decays exponentially in the direction perpendicular to the surface of the waveguide with the distance away from the interface,such as the surface plasmon(Surface Plasmon Polaritons,SPPs),nano-fiber surface evanescent waves,which have excellent characteristics such as local field enhancement,which can significantly enhance the interaction between the optical field and the medium,thereby realizing the strong coupling interaction between the two and promoting the nonlinear optical phenomenon.This has provided a new platform and subject for the study of nonlinear and quantum interference effects,as well as new opportunities for obtaining relevant scientific discoveries and applications.The main purpose of this paper is to develop and deal with the resonant interaction of evanescent wave and atomic medium in the micro-nano waveguide system through the study of the quantum interference of the evanescent wave and the coherent medium in the Metal-Dielectric-Metal(MDM)waveguide and nanofiber.To further develop the basic theory and calculation methods for dealing with the resonant interaction between evanescent wave and atomic medium in micro-nano waveguide systems,and explore its potential applications in micro-nano integrated all-optical information processing.The main research contents and results of this article include the following aspects:1.Research on SPPs capture and trajectory coherent manipulation in metaldielectric-metal waveguides.Based on double electromagnetically induced transparency(DEIT)mechanism and cross-phase modulation(CPM),we propose a nonlinear magneto-optical control scheme for capturing and controlling low-loss SPPs.First,the use of incoherent pumping mechanism greatly suppresses the ohmic loss of SPPs in the waveguide,and realizes the linear long-distance stable propagation of slow-light SPPs.Secondly,using the SPPs in the waveguide and the inverted Y energy level excited configuration hot atomic gas DEIT provided by the giant Kerr effect and the diffraction effect of SPPs to achieve the balance of the SPPs soliton generation,and the use of SPPs solitons,using CPM to achieve capture the low light level SPPs,and further through the regulation of the captured SPPs,the defocused SPPs can be refocused.Finally,using the external gradient magnetic field,the SPPs-like Stern-Guilach effect is realized,that is,SPPs can be deflected in the gradient magnetic field.By adjusting the spatial distribution and time of the external gradient magnetic field,we have realized the control of the trajectory of the SPPs.The results obtained by this research have potential application value in optical integration and optical information processing on all-optical chips in the future.2.Research on the storage and reading of slow-light solitons on the surface of nanofibers.We theoretically studied the optical storage effect based on electromagnetically induced transparency(EIT)in the nonlinear interval nanofiber system.Because the light is tightly bound on the surface of the nanofiber,the interaction between light and atoms is greatly enhanced,and at the same time,the EIT effect is also enhanced.Due to the non-uniform distribution of modes,the dispersion of EIT also has the characteristics of non-uniform spatial distribution.We developed a set of average field theory to systematically deal with inhomogeneous effects in the system,and discovered the existence of solitons on the surface of nano-fibers,and based on the EIT mechanism to achieve high-efficiency and high-fidelity storage and reading of solitons on the surface of nano-fibers.At the same time,it provides a theoretical scheme for optimizing the storage of soliton on the surface of nano-fiber.This work has important application value in the fields of optical interconnection and all-optical information processing.3.Research on quantum interference effect in crystal materials doped with rare earth ions.We selected two typical energy-level excitation configurations,including Λ-type and V-type,and considered the non-uniform broadening of energy levels,and systematically studied the characteristics of quantum interference effects in doped rare-earth ion crystal materials.Studies have found that under weak control light conditions,there is destructive quantum interference in the Λ-type system,which leads to the EIT effect in the absorption spectrum of the probe light near the resonance frequency.As the intensity of the control light gradually increases,the quantum interference effect in the absorption spectrum,the contribution of declining gradually.The absorption spectrum of the bimodal structure gradually increases with the control of the light intensity,and the EIT-AutlerTownes splitting transition effect occurs.In the V-type system,the appearance of the transparent window in the detection light absorption spectrum is mainly due to the saturated absorption effect,and the quantum interference is constructive interference.This work has developed a set of methods for processing spectral decomposition in non-uniformly broadened media,and the results obtained have application value in solid-state all-optical information processing and other fields.This thesis consists of six chapters: Chapter 1 is an overview,mainly introducing the interaction between evanescent waves and coherent media in the micronano waveguide structure and its research progress,and introducing the nonlinear effects and nonlinear effects of surface plasmons.Magneto-optical control and its research progress,as well as the storage and reading of optical soliton and nonlinear optical pulse.The Chapter 2 mainly introduces the theoretical method of electromagnetic field mode analysis of the micro-nano waveguide studied in the article,and introduces the general theoretical method of studying the interaction of light and matter.Chapters 3 to 5 are research work based on theoretical methods.Chapters 3 studies the capture and trajectory manipulation of the weak light field signal of the metal-dielectric-metal waveguide structure.Chapter 4 studies the optical storage and reading based on the electromagnetic induction transparent mechanism in nano-fibers.Chapter 5 studies the quantum interference effect of crystal materials doped with rare earth elements.Chapter 6 is a summary of the work done and looking forward to future research work. |
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