The increasing demand for high-performance optical components in optical integrated systems calls for tunable filter with broadband and narrowband tunability. Here, we propose four designs of tunable metasurface absorber (TMA) composed of suspended nanodisk metasurface with single- and dual-layer Al/SiO₂ and Al/LiNbO₃ thin-films on Si substrate coated with an Al mirror layer atop, which are denoted as TMA-S1, TMA-S2, TMA-L1, and TMA-L2, respectively. Four devices show the resonant wavelengths with ultrabroad tuning ranges and perfect absorptions. The broadest tuning ranges are 239 nm, 400 nm, 293 nm, and 400 nm, which can be designed to span 60%, 100%, 73% and 100% of visible spectra range for TMA-S1, TMA-S2, TMA-L1 and TMA-L2, respectively. TMA-S2 and TMA-L2 exhibits the characterizations of stronger absorption intensity and narrower bandwidth compared to TMA-S1 and TMA-L1. Furthermore, the absorption resonances of devices are red-shifted by changing ambient refractive index. The corresponding sensitivities are 292.85 nm/RIU, 277.14 nm/RIU, 458.57 nm/RIU and 401.25 nm/RIU for TMA-S1, TMA-L1, TMA-S2 and TMA-L2 respectively. The proposed designs of TMA open an avenue to the possibilities for high-efficiency wavelength-selective devices and high-performance refractive index sensors in the visible spectral range.

光学集成系统中对高性能光学组件的需求不断增长，因此需要具有宽带和窄带可调性的可调滤波器。在这里，我们提出了四种可调谐超表面吸收器（TMA）设计，它们由悬浮的纳米盘超表面与单层和双层Al / SiO ₂和Al / LiNbO _3组成在Si基板上覆有Al镜层的薄膜，分别表示为TMA-S1，TMA-S2，TMA-L1和TMA-L2。四个器件显示出具有超宽调谐范围和完美吸收的谐振波长。最宽的调谐范围是239 nm，400 nm，293 nm和400 nm，可以设计为覆盖TMA-S1，TMA-S2，TMA-的可见光谱范围的60％，100％，73％和100％ L1和TMA-L2。与TMA-S1和TMA-L1相比，TMA-S2和TMA-L2具有更强的吸收强度和更窄的带宽的特征。此外，通过改变环境折射率，器件的吸收共振发生红移。对于TMA-S1，TMA-L1，TMA-S2和TMA-L2，相应的灵敏度分别为292.85 nm / RIU，277.14 nm / RIU，458.57 nm / RIU和401.25 nm / RIU。