十字架型超材料吸波特性及机理研究  

Study on absorbing properties and mechanism of cross-shaped metamaterial absorber

作　　者：弓巧侠[1] 刘晓旻[1] 段智勇[1] 师小强[1] 马凤英[1] 梁二军[1] 

机构地区：[1]郑州大学物理工程学院,河南郑州450001

出　　处：《红外与激光工程》2013年第6期1528-1532,共5页Infrared and Laser Engineering

基　　金：国家自然科学基金(51175479);河南省教育厅科学技术研究重点项目(13B140395;12A140014)

摘　　要：设计了一种十字架型电磁超材料吸波体,采用CST studio suite 2009频域求解器提取S参数进行仿真研究,并计算了其吸波率,在24.65 THz和35.25 THz得到两个吸收峰,吸收率分别为0.83和0.997。改变材料结构尺寸,在7.3 THz达到完美吸收,吸收率接近于1。将THz波段的超材料吸波体结构尺寸放大1000倍,在GHz波段同样可以达到完美吸收,说明超材料吸波体可通过对结构尺寸调节改变吸收波段。另外研究了这种吸波体的吸收机理,发现吸收主要在第一层的十字架金属单元层,可用于Bolometer探测器的设计。A cross-shaped metamaterial absorber was designed. The S parameters and absorptivity were calculated by CST studio suite 2009, and the frequency domain solver was utilized. The absorber shows two absorption peaks of 0.83 at 24.65 THz and 0.997 at 35.25 THz. Through changes of the size of elements, a metamaterial perfect absorber with near-unity absorbance is achieved in 7.3 THz. To magnify 1 000 times of the absorber size in terahertz frequency, the perfect absorber can be achieved in the GHz frequency, thus providing a means to dynamically control the absorbing band. In addition, the absorbing mechanism was studied. Simulations reveal that the majority of energy is dissipated in the metallic cross plane. This type of metamateial absorber can be designed for the bolometer detector.

关 键 词：超材料 吸波体 THZ 探测器 

分 类 号：O43[机械工程—光学工程]