Hoque Ahasanul, Islam Mohammad Tariqul, Almutairi Ali F
Institute of Climate Change, Universiti Kebangsaan Malaysia, 43600, Bangi, Selangor, Malaysia.
Department of Electrical, Electronic and Systems Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, 43600, Bangi, Selangor, Malaysia.
Sci Rep. 2025 Jan 2;15(1):275. doi: 10.1038/s41598-024-82254-5.
This article reports an Ultra wideband nano scale metamaterial absorber with ultrathin and flexible feature for visible spectrum applications. The absorber investigated for dispersion and Fano resonance characteristics to achieve metamaterial properties as well as independent of asymmetry of structure. Maximum visible spectrum wave interaction with the cascaded split nano square meta atom also ensured to achieve the absorption at highest percentage in numerical evaluation. The Finite Difference Time Domain (FDTD) method incorporated with CST microwave studio computational tool used for the entire analysis. Numerical analysis revealed that, on average 86.66% absorption achieved for 560 THz bandwidth peak absorption for the unit cell was 99.88% and the array shows 99.79%. Dispersion gap optimized based on mode 4 to incorporate all photons for phase and group velocity inside the nano metamaterial absorber. Furthermore, the Fano resonance wave to identify the high-quality factor at visible spectrum on nanostructure meta atom and direct-indirect visible wave trapped in the structure. The dispersion gap optimization and Fano resonance make the proposed cascaded split nano square meta atom a significant candidate for visible spectrum applications like solar energy harvesting, biochemical sensing, optical range application etc.
本文报道了一种具有超薄和柔性特性的超宽带纳米级超材料吸收体，用于可见光谱应用。对该吸收体进行了色散和法诺共振特性研究，以实现超材料特性，且与结构不对称无关。与级联分裂纳米方形元原子的最大可见光谱波相互作用也确保了在数值评估中获得最高百分比的吸收。采用有限差分时域（FDTD）方法结合CST微波工作室计算工具进行整体分析。数值分析表明，对于560太赫兹带宽，平均吸收率达到86.66%，单元胞的峰值吸收率为99.88%，阵列的吸收率为99.79%。基于模式4优化色散间隙，以将纳米超材料吸收体内所有光子的相速度和群速度纳入其中。此外，利用法诺共振波来识别纳米结构元原子在可见光谱下的高品质因子以及被困在结构中的直接-间接可见波。色散间隙优化和法诺共振使得所提出的级联分裂纳米方形元原子成为太阳能收集、生化传感、光学范围应用等可见光谱应用的重要候选者。
