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The optical metasurface formed by the periodic arrangement of micro-nano structures with sub-wavelength size can efficiently sense and control the polarization, amplitude and phase of electromagnetic waves. When the light incident on the metasurface, the resonance response based on the plasmon will be generated at the position of wave vector matching in the periodic micro-nano structure, which will change the surface charge distribution characteristics. The properties of light reflection, light transmission, light absorption and local enhancement of the metasurface in infrared band can be effectively improved by setting the size, shape, material composition and period spacing of the surface micro -nano structure reasonably. Based on the characteristics of plasmon on solid surface, the metasurface composed of metal excitation layer of titanium array is designed. The local enhanced metasurface with low reflection characteristics is obtained by reasonable configuration of titanium structure parameters such as size and period. In order to further improve its optical transmittance in infrared band, a variety of substrate materials, such as silicon, silicon dioxide and zinc selenide, were simulated and verified. Finally, a zinc-selenide titanium array metasurface with an average transmittance of 68% in 1-14μm band was obtained.
Ji et al. (Thu,) studied this question.