Plasmonic metasurface with extraordinary properties are promising for numerous frontier applications. In this work, we reported the ultrahigh multiband absorption in a silver-nanoarray and semiconductor hybrid metasurface. The structural parameters, carrier mobility and the medium environment dependence were discussed in detail. Comparing with traditional SiO₂ spacer, metasurface with semiconductor interlayer can be beneficial in expanding the absorption band and increasing the absorbance. The carrier mobility and thickness of the semiconductor film were proved to be key factors in adjusting and enhancing the absorption bands. The spectra split and shift can be attributed to the combination effect of the cavity resonance mode and the local SPR mode of the silver bar. According to the proper design, absorption of 95% for both visible and NIR band was achieved. This structure also showed a sensitivity of ~250 nm/RIU during the refractive index sensing. These findings provided a promising path to achieve ultrahigh efficiency and adjustable multiband absorption by applying semiconductors, and can be instructive in the design of tunable plasmonic absorber and photoelectric detector.

具有非凡性能的等离子超颖表面有望用于众多前沿应用。在这项工作中，我们报道了银纳米阵列和半导体混合超表面中的超高多波段吸收。详细讨论了结构参数，载流子迁移率和介质环境依赖性。与传统SiO ₂相比间隔层，具有半导体中间层的超表面可有利于扩大吸收带并增加吸收率。事实证明，半导体膜的载流子迁移率和厚度是调节和增强吸收带的关键因素。光谱的分裂和移动可以归因于腔共振模式和银条的局部SPR模式的组合效应。根据适当的设计，可见光和NIR波段的吸收率均达到95％。在折射率感测期间，该结构还显示出〜250 nm / RIU的灵敏度。这些发现为通过应用半导体实现超高效率和可调节的多频带吸收提供了一条有希望的途径，并且对可调谐等离子体吸收器和光电探测器的设计具有指导意义。