Figure 1. Fabrication, morphology, and near-infrared reflectance spectra of a composite grating. Figure 2. Morphology of composite grooved gratings, reflection spectra corresponding to different grating stripe widths, and electric field distribution in different modes. Recently, the Optical and Functional Film Research Group of the Optical Technology Center of the Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, based on the plasmon hybrid model, proposed a method that can ensure strong irrational light field while ensuring low ohmic losses. Composite grating nanostructures that function. The research results are published in Advanced Optical Materials. This work was supported by the National Natural Science Foundation of China's key projects and projects. The interaction of light and matter through the plasmonic nanostructures can bring about a strong optical field confinement effect, which means that the energy can be effectively controlled and compressed at the micrometer or nanometer scale. The small optical mode volume has important significance for device design, and has broad application prospects in terms of constructing super-surface materials, breaking the diffraction limit, and achieving highly integrated optical components. Due to the presence of metal parts in the plasmonic structure, large ohmic losses are unavoidable. Loss can directly reduce the efficiency of the device. For materials with large thermal coefficients (such as common semiconductor silicon, etc.), the thermal loss causes the material properties to change, causing instability of the device operating state. Therefore, how to use mode coupling and other methods to reduce the loss of the structure under the premise of ensuring a small light mode volume is one of the current research hotspots. Researchers used laser direct writing to prepare two multilayer silicon-aluminum composite grating structures. In the first structure, a symmetrical metal-medium-metal waveguide is formed by alternately arranged five-layer silicon-aluminum films, and the excited surface plasmon will form FP resonance in the dielectric layer waveguide, so that the reflection spectrum has obvious Frequency-selective characteristics and linear tunable characteristics. The resonance peak wavelength can be strictly solved by the symmetric waveguide theory, and the results are highly consistent with the time-domain finite difference simulation results. In the second structure, the composite grating consists of two parts: a grating strip and a deep groove structure. In addition to FP resonances, deep trench structures stimulate the generation of cavity effects and introduce other resonant modes. The generation of new modes can be observed under oblique light incidence conditions. These modes couple at specific wavelengths to form a CS hybrid mode. In addition, by changing the width of the grating waveguide, the FP resonance mode and the cavity resonance mode are regularly coupled to generate a hybrid mode. This phenomenon has been accurately verified through experiments. The researchers calculated the quality factor of the two structures to evaluate their ohmic losses. The higher the quality factor, the lower the loss of the structure. It can be found through calculation that, compared to the first structure, the quality factor of the second composite deep groove grating structure increases by two orders of magnitude, reaching 313.81. This shows that the composite deep-groove grating excitation by the hybrid mode achieves the coexistence of strong optical field confinement and low ohmic loss, providing support for the design of high-quality isolator components in the future. gas stove valve,Adjustable Angle Valve,pulse ignition ,electronic ignition,regulator valve GUOLONG PRECISION VALVE CO.,LTD , https://www.glstovevalve.com
