Design of an ultra-broadband near-perfect bilayer grating metamaterial absorber based on genetic algorithm
Design of an ultra-broadband near-perfect bilayer grating metamaterial absorber based on genetic algorithm
复制标题
基于遗传算法的超宽带近乎完美双层光栅超材料吸收体设计
DOI：
10.1364/oe.393423
复制
发表时间：
2020-05-11
期刊：
影响因子：
3.8
通讯作者：
Zhan, Shuyue
中科院分区：
文献类型：
--
作者：
Cai, Haoyuan;Sun, Yi;Zhan, Shuyue
采用严格耦合波分析（RCWA）和遗传算法（GA）方法，提出并设计了一种由SiO2薄膜和Ti衬底上的二维SiO2-Ti方形双层光栅组成的超宽带超材料吸波器。优化后的结构在300 ~ 2100 nm波长范围内的平均吸收率为98.3%。此外，对于TM和te极化波，超材料吸收体与极化无关，并且对入射角不敏感。利用时域有限差分（FDTD）方法和电感-电容（LC）电路模型，明确分析了近完美宽带吸收的物理机制，包括Wood异常（WA）、腔共振（CR）、表面等离子激元（SPPs）和磁激元（MPs）的共振。总的来说，所提出的超材料吸收体在太阳能应用中是一个很有前途的候选者。(c)根据OSA开放获取出版协议的条款，2020年美国光学学会
An ultra-broadband metamaterial absorber, consisting of 2D SiO2-Ti square bilayer grating on SiO2 film and Ti substrate, is proposed and designed by rigorous coupled wave analysis (RCWA) and genetic algorithm (GA) methods. The optimized structure shows an average absorption of 98.3% in the wavelength range of 300 nm to 2100 nm. Moreover, the metamaterial absorber is polarization-independent and also insensitive to incidence angle for both TM- and TE-polarized waves. The physical mechanisms responsible for nearly perfect broadband absorption, including the Wood's anomaly (WA), cavity resonance (CR), surface plasmon polaritons (SPPs) and the resonance of magnetic polaritons (MPs), have been analyzed clearly by finite-difference time-domain (FDTD) method and the inductor-capacitor (LC) circuit model. Overall, the proposed metamaterial absorber is a promising candidate in solar applications. (c) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement