Study On The Regulation Of Interaction Between Plasmon And Microcavity

Surface plasmon polaritons（SPPs）,as an electromagnetic wave confined to the surface of metal and medium,has attracted much attention in recent years because of its ability to break through the traditional integrated optical diffraction limit and facilitate integration into miniaturized devices.The wave field energy is locally maximized at the interface of the two media,and then decays exponentially to both sides.In this process,it shows a strong constraint of electromagnetic field amplification,which provides a new direction for future new technologies such as the regulation of light field and the interaction between light and matter on the nano scale.As a kind of typical surface plasmon waveguide,optical microcavity can provide the ability of light field back and forth oscillation in sub wavelength scale,realize the interaction between symmetric electromagnetic mode and antisymmetric electromagnetic mode in the resonator,integrate with other unit devices,realize rich coupling phenomena,and provide technical guarantee for micro nano photonic devices.In addition,because the excitation phase shift of microcavity plasmon depends on the environment,the coupled microcavity photonic plasma structure has higher sensitivity to environmental changes than the traditional local plasmon sensor.In this paper,we use FDTD simulation calculation and theoretical analysis to explore the absorption characteristics and special physical phenomena of the composite structure combined with microcavity and metal periodic array,and further explore the role of two-dimensional materials,which provides an imaginative platform for the regulation of coupling interaction.The specific research contents are as follows:1.A composite system based on Fabry Perot microcavity and silver nano periodic antenna array.We theoretically investigated the multi-mode coupling among the localized surface plasmon resonance,the lattice mode in Ag nanorod array,and the resonant Fabry-Perot microcavity using the finite-difference time-domain（FDTD）method.A huge Rabi splitting of 1.46 eV and anti-crossing behavior in the new established hybrid modes are observed in the calculated absorption spectra of the hybrid nanostructure.The coupling system can be controlled by adjusting the thickness of the Fabry-Perot microcavity.We further analyze the weighting efficiencies of each original mode by calculating the Hopfield factor using the coupled oscillator model.Our work proposes the tunable multi-mode ultra-strong coupling system,which paves the way for room-temperature quantum applications such as optical modulators,multi-mode lasers,and multi-mode sensors in the optical and infrared ranges.2.Research on the regulation of microcavity interaction based on new materials such as two-dimensional materials,organic fluorescent dye molecules,graphene,perovskite and metamaterials.The development background and unique advantages of today’s hot new materials are analyzed,especially in terms of optical properties.The characteristic dielectric constant of the materials is calculated and analyzed,and the influence of temperature on new materials with similar semiconductor properties is analyzed.WS is given₂ and the exciton resonance relationship with temperature.With WS_The addition of 2 has an impact on the interaction of microcavity metal array system,resulting in four branch Rabi splitting,and the huge original splitting remains unchanged.On this basis,a small coupling splitting of about 100MeV is expanded,which can deduce the important role of different materials in more mode modulation in the process of super coupling.In environmental conditions and large spectral range,it provides favorable technical support and platform for truly applicable quantum optical multi bit modulator and communicator.