A wideband metasurface absorber covering the visible to ultraviolet (UV) region (340 THz to 1150 THz) is numerically presented in this paper. The topmost layer consists of a periodic metallic array of L-shaped metasurface followed by a dielectric layer and thick metallic substrate. The nanostructure L-shaped metasurface array made up of tungsten material is used to enhance absorption spectra in the visible to the UV region. The average absorption resulted in an efficiency of 92.2% in the visible spectra (430 THz to 770 THz) and 73.6% absorption in the ultraviolet spectra (771 THz to 1150 THz). The absorption band has a close relationship with change in different parameters of the L-shaped metasurface absorber design is also investigated. The dual broadband achieves average absorption of more than 90% in visible region from 475 THz to 742 THz and in the ultraviolet region from 1010 THz to 1055 THz. The absorption is also investigated for inserted electromagnetic with different oblique incidence, which shows that the proposed absorber is achieving more than 80% absorption in-between 0° to 40° in the visible region from 470 THz to 750 THz. The presented broadband absorber is ultra-thin and single sized nanostructure can be used to scale large area photonics applications.

本文以数值形式展示了覆盖可见到紫外（UV）区域（340 THz至1150 THz）的宽带超表面吸收器。最顶层由周期性的L形超表面金属阵列，电介质层和厚金属基底组成。由钨材料制成的纳米结构的L形超表面阵列用于增强UV区可见光的吸收光谱。平均吸收导致可见光谱（430 THz至770 THz）的效率为92.2％，而紫外线光谱（771 THz至1150 THz）的吸收率为73.6％。还研究了吸收带与L形超表面吸收器设计中不同参数变化的密切关系。双宽带在475 THz至742 THz的可见光区域和1010 THz至1055 THz的紫外光区域实现了90％以上的平均吸收。还针对具有不同倾斜入射角的插入电磁体研究了吸收率，这表明所提出的吸收器在470 THz至750 THz的可见光区域中，在0°至40°之间实现了80％以上的吸收。提出的宽带吸收器是超薄的，单一尺寸的纳米结构可用于扩展大面积光子学应用。