可见光和近红外区域宽带超材料吸收器的设计

Design of broadband metamaterial absorber in the visible and near-infrared region

电磁波吸收器是一种能够吸收和湮灭电磁波的装置,广泛应用于军事、科技和人民生活的各个领域。基于超材料的吸收器由于其强大的吸收电磁波的能力、超薄特性以及设计的灵活性而受到广泛关注。但此类吸收器存在带宽窄的问题,因此,设计了一种基于金属–介电–金属(metal-dielectric-metal,MDM)结构的宽带超材料吸收器。对其吸收原理和物理机制进行了分析,并对其结构参数进行了仿真模拟。结果表明,超材料吸收器对于490~1790 nm的入射光的吸收率高于80%,平均吸收率可达90%,最佳工作角度为30°。此外,通过修改单元结构的对称性,可以实现偏振相关调控。所提出的超材料吸收器非常适合于太阳能光伏、光通信、滤波和传感等方面的应用。

An electromagnetic wave absorber is a device that can absorb and annihilate electromagnetic waves,which is widely used in various fields of military,science and technology,and people’s livelihood.Absorbers based on metamaterials have received considerable attention due to their potent ability to absorb electromagnetic waves,ultra-thin characteristics,and design flexibility.In this paper,we design a broadband metamaterial absorber based on metal-dielectricmetal(MDM)structure,and analyze the absorption principle and physical mechanism,and simulate the parameters of the structure.The results show that the metamaterial absorber has an absorption rate higher than 80%for incident light from 490-1790 nm,with an average absorption rate of up to 90%and an optimal operating angle of 30°.In addition,the polarization-dependent tuning can be performed by modifying the symmetry of the cell structure.The proposed broadband metamaterial absorber is well suited for solar photovoltaic,optical communication,filtering and sensing applications.