论文标题
近乎完美的宽带红外超材料吸收器利用镍
Near-Perfect Broadband Infrared Metamaterial Absorber Utilizing Nickel
论文作者
论文摘要
我们提出了基于钨反射器，硅间隔物以及由使用镍（Ni）的双方样环谐振器组成的薄，紧凑，宽带，极化和角度不敏感的超材料吸收器。在这样的结构中，可以通过深层亚波长度细胞尺寸实现高吸收（高于80％）的带宽〜4.8μm，从3.52到8.32μm，与相对带宽〜81％相对应。在这里，宽带吸收的物理起源与顶部图案内部和外侧的低Q因子偶极偶极子模式相关，该模式作为矩形纳米antennas起作用。由于结构对称性，吸收器在TE和TM极化的相对较大范围内显示出良好的入射角耐受性。使用本构有效培养基理论检索了基于NI的吸收器的有效参数，并比较了有效培养基和超材料的吸收特征。
We propose a thin, compact, broadband, polarization and angle insensitive metamaterial absorber based on a tungsten reflector, silicon spacer and a top pattern composed of a double square-like ring resonator utilizing nickel(Ni). In such a structure, a high absorption (above 80 %) bandwidth ~ 4.8 μm from 3.52 up to 8.32 μm corresponding to the relative bandwidth ~81% can be achieved with deeply subwavelength unit cell dimensions. Here the physical origin of the broadband absorption is associated with low Q-factor dipole modes of the top pattern inner and outer sides functioning as rectangular nanoantennas. Owing to the structural symmetry, the absorber shows a good incidence angle tolerance in the relatively wide range for both TE and TM polarizations. The effective parameters of the Ni-based absorber were retrieved using the constitutive effective medium theory and the absorption characteristics of the effective medium and metamaterial were compared.
