基于金属-介质-金属结构的太赫兹超材料宽阻带滤波器（英文）

Terahertz wide stop-band metamaterials filter based on metal-dielectricmetal structure

为了实现具有多频或宽频特性的太赫兹超材料滤波器,通常将相同或不同的谐振结构在同一平面内进行组合或者进行多层堆叠.通过将尺寸相同的C-型谐振单元分别置于中间介质层的两端,实现了基于金属-介质-金属结构的太赫兹超材料宽阻带滤波器,该滤波器具有较宽的阻带和较好的频率选择性.基于对该太赫兹超材料宽阻带滤波器C-型谐振结构表面的电场和电流分布的仿真分析,深入探讨了入射太赫兹波的传输机理,揭示了滤波器的滤波机制.基于对金属-介质-金属结构和金属-介质结构的超材料滤波器的滤波特性的仿真研究,揭示了宽阻带的形成机理.最后,采用PDMS薄膜制备工艺和金属磁控溅射方法对该超材料滤波器的样品进行了加工制备,并采用传输型的太赫兹时域光谱系统对其滤波特性进行了实际测试,验证了该超材料滤波器的结构设计、仿真和制备的正确性,为今后宽频带超材料滤波器的设计、制备和特性研究提供了参考.

In order to realize terahertz(THz)metamaterials(MMs)filters with multi-band or wide-band characteristics,the same or different resonance structures are usually combined in the same plane or stacked in multiple layers.THz wide stop-band MMs filter based on Metal-Dielectric-Metal(MDM)structure is presented by placing C-shaped resonance elements of the same size at both ends of the middle dielectric layer,which has the broader stop-band and the better frequency selection.Based on the analysis of the electric field and surface current distributions on the C-shaped resonance elements of the wide stop-band MMs filter,the transmission mechanism of THz wave is discussed in depth,and the filtering mechanism of the filter is revealed.The filtering characteristics of the MMs filter based on MDM structure and Metal-Dielectric(MD)structure are simulated respectively,and the formation mechanism of wide stop-band is revealed.Finally,the MMs filter samples are prepared based on PDMS thin films preparation process and magnetron sputtering,and their filtering characteristics are tested by transmission-type Terahertz Time Domain Spectroscopy(THz-TDS)TDS 1008.The correctness of design,simulation and preparation of wide stop-band MMs filter is verified,which provides reference for the design,fabrication and characteristic research of wide band filters in the future.