Musa Ahmad, Hakim Mohammad Lutful, Alam Touhidul, Islam Mohammad Tariqul, Alshammari Ahmed S, Mat Kamarulzaman, M M Salaheldeen, Almalki Sami H A, Islam Md Shabiul
Pusat Sains Ankasa (ANGKASA), Institut Perubahan Iklim, Universiti Kebangsaan Malaysia, Bangi 43600, Selangor, Malaysia.
Department of CSE, International Islamic University Chittagong (IIUC), Kumira, Chattogram 4318, Bangladesh.
Materials (Basel). 2022 May 23;15(10):3733. doi: 10.3390/ma15103733.
The visible and infrared wavelengths are the most frequently used electromagnetic (EM) waves in the frequency spectrum; able to penetrate the atmosphere and reach Earth's surface. These wavelengths have attracted much attention in solar energy harvesting; thermography; and infrared imaging applications for the detection of electrical failures; faults; or thermal leakage hot spots and inspection of tapped live energized components. This paper presents a numerical analysis of a compact cubic cross-shaped four-layer metamaterial absorber (MA) structure by using a simple metal-dielectric-metal-dielectric configuration for wideband visible and infrared applications. The proposed MA achieved above 80% absorption in both visible and near-infrared regions of the spectrum from 350 to 1250 nm wavelength with an overall unit cell size of 0.57λ × 0.57λ × 0.59λ. The SiO based anti-reflection coating of sandwiched tungsten facilitates to achieve the wide high absorption bandwidth. The perceptible novelty of the proposed metamaterial is to achieve an average absorptivity of 95.3% for both visible and infrared wavelengths with a maximum absorptivity of 98% from 400 nm to 900 nm. Furthermore, the proposed structure provides polarization insensitivity with a higher oblique incidence angle tolerance up to 45°.
可见光和红外波长是频谱中最常用的电磁波；能够穿透大气层并到达地球表面。这些波长在太阳能收集、热成像以及用于检测电气故障、故障或热泄漏热点的红外成像应用和带电带电部件检查方面备受关注。本文通过使用简单的金属 - 电介质 - 金属 - 电介质配置，对一种紧凑的立方十字形四层超材料吸收器（MA）结构进行了数值分析，用于宽带可见光和红外应用。所提出的MA在波长为350至1250nm的光谱的可见光和近红外区域均实现了80%以上的吸收，整体单元尺寸为0.57λ×0.57λ×0.59λ。夹在中间的钨的基于SiO的抗反射涂层有助于实现宽高吸收带宽。所提出的超材料的显著新颖之处在于，对于可见光和红外波长，平均吸收率达到95.3%，在400nm至900nm范围内最大吸收率为98%。此外，所提出的结构提供了偏振不敏感性，具有高达45°的更高斜入射角容差。
