论文标题
基于导电带状元素元件的宽带可调中红外吸收器
Broadband tunable mid-infrared absorber based on conductive strip-like meta-atom elements
论文作者
论文摘要
在中红外光谱中，由薄金属条作为有效的宽带吸收剂组成的超材料被研究。在这里，各个元素的介电和几何特性之间的匹配对于确保高吸收至关重要。进行基于电偶极近似的详细理论分析，以表征单元单元单个元素的吸收和散射特性，并将结果用于设计由此类构型组成的超材料。条状元件的吸收横截面可以超过其纵向几何横截面面积17倍。结果表明，在约8.2-18 um频谱中，基于Ni的金属胰蛋白基 - 金属（MIM）超材料结构的吸收性可能超过90％。宽带吸收与条带的低q因子偶极子模式的激发有关。这种吸收器表现出良好的极化和横向电波（TE）波的入射角耐受性。吸收光谱可以通过不同的单个元素参数来调节。
A metamaterial composed of thin metallic strips as an efficient broadband absorber in the mid-infrared spectrum is investigated. Here the matching between dielectric and geometrical properties of the individual elements is critical to ensure high absorption. Detailed theoretical analysis based on the electric dipole approximation is performed to characterize the absorption and scattering properties of the individual elements of the unit cell and the results are used to design the metamaterial composed of such configurations. The absorption cross-section of a strip-shaped element can exceed its longitudinal geometrical cross-section area by 17 times. It was shown that the absorptance of the Ni-based metal-insulator-metal (MIM) metamaterial structure can exceed 90 % in about 8.2 - 18 um spectrum. The broadband absorption is associated with the excitation of the low-Q-factor dipole modes of the strips. Such an absorber demonstrates good polarization and incident angle tolerance for transverse-electric (TE) waves. The absorption spectrum can be tuned by varying individual element parameters.
