An ultrathin broadband metasurface-based absorber, comprised of tungsten nanowires, was studied under the normal and oblique incidence of transverse electric (TE) and transverse magnetic (TM) waves. The effect of geometrical parameters on the absorption spectra was investigated through the surface electric field and power patterns at certain operating wavelengths. The structure was found to exhibit nearly perfect absorption in the ultraviolet (UV) span of ~350–400 nm and ~85% absorptivity in the visible spectral range of ~400–750 nm. The attempt was also made to validate the simulation results with that obtained upon homogenization of the metasurface using the effective medium theory. Further, to optimize the results, the performance of the proposed absorber was analyzed in terms of the figure of merit and operating bandwidth, the highest values of which were obtained to be 95% and 450 nm, respectively. With the viewpoint of achieving relatively wideband absorption, it is expected that the proposed absorber can be effectively used in biosensing, solar cell and thermal emitter applications.

研究了由钨纳米线组成的超薄宽带超表面吸收器，该吸收器是在横向电波（TE）和横向磁波（TM）的垂直和斜入射下进行研究的。通过在某些工作波长下的表面电场和功率模式，研究了几何参数对吸收光谱的影响。发现该结构在〜350–400 nm的紫外线（UV）范围内表现出近乎完美的吸收，在〜400–750 nm的可见光谱范围内的吸收率约为〜85％。还尝试使用有效介质理论，通过将超表面均质化后获得的模拟结果来验证模拟结果。此外，为了优化结果，根据性能因数和工作带宽对建议的吸收器的性能进行了分析，其最高值分别为95％和450 nm。从实现相对宽带吸收的观点来看，期望所提出的吸收器可以有效地用于生物传感，太阳能电池和热发射器应用中。