亚波长金属阵列结构太赫兹透射特性及可调器件研究
发布时间：2018-11-03 20:10
【摘要】：近年来,太赫兹波由于其独特的性质及广泛的应用前景而受到越来越多的关注,成为众多学科领域研究热点之一。亚波长金属阵列结构在太赫兹波传输控制方面具有重要的科研及应用价值,为了更好地探索基于太赫兹波的亚波长结构的功能器件,本文研究了不同结构的双层亚波长金属阵列结构,对其进行传输特性仿真分析,开展了实验与测试,并设计了基于液晶材料电控可调器件。主要内容如下:设计了F波段单层环形金属亚波长阵列结构、双层孔和双层(圆和方)环形金属亚波长阵列结构。通过数值仿真,优化了如金属孔直径、金属厚度及石英厚度等结构参数;分析了入射角和周期错位等因素对透射特性的影响,实现了透射带宽33GHz,最大透射率91%;同时,加工了阵列为50×50和40×40、边长为4cm的双层圆和方环形金属阵列结构样品,并搭建测试平台,开展了透射特性的测试,实际透射率低于仿真模拟的10%左右;对实验过程中出现的误差等因素进行了分析总结。在双层金属阵列结构的基础上,设计了一种基于液晶材料和双层金属圆孔阵列的太赫兹调制器。通过调节液晶介电常数,在340GHz对垂直入射电磁波实现91.3%的调制深度。通过仿真分析不同入射角情况下该阵列结构的传输特性,可以发现当电场矢量平行于金属表面时,斜入射电磁场的幅值仍然能够得到有效调制。模拟结果表明,上述结构可以应用于太赫兹自由空间传输系统中。
[Abstract]:In recent years, terahertz wave has attracted more and more attention due to its unique properties and wide application prospects, and has become one of the research hotspots in many disciplines. The subwavelength metal array structure has important scientific research and application value in the field of terahertz wave transmission control. In order to better explore the functional devices based on terahertz wave subwavelength structure, In this paper, the double-layer sub-wavelength metal array structures with different structures are studied, the transmission characteristics are simulated and analyzed, the experiments and tests are carried out, and the electronic controlled tunable devices based on liquid crystal materials are designed. The main contents are as follows: the F-band monolayer ring metal subwavelength array structure, double hole and double layer (circular and square) ring metal subwavelength array structure are designed. Through numerical simulation, the structural parameters such as the diameter of metal hole, the thickness of metal and the thickness of quartz are optimized, and the influence of incident angle and period dislocation on transmission characteristic is analyzed. The transmission bandwidth is 33GHz and the maximum transmittance is 91. At the same time, the double-layer circular and square ring metal array samples with 50 脳 50 and 40 脳 40 arrays with side length of 4cm are fabricated, and the transmission characteristics are tested. The actual transmittance is less than 10% of the simulated data. The error and other factors in the experiment are analyzed and summarized. A terahertz modulator based on liquid crystal material and double metal circular hole array is designed. By adjusting the dielectric constant of the liquid crystal, the modulation depth of 91.3% of the electromagnetic wave is achieved at 340GHz. By analyzing the transmission characteristics of the array at different incident angles, it is found that the amplitude of oblique incident electromagnetic field can still be modulated effectively when the electric field vector is parallel to the metal surface. The simulation results show that the above structure can be applied to terahertz free space transmission system.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O441.4
[Abstract]:In recent years, terahertz wave has attracted more and more attention due to its unique properties and wide application prospects, and has become one of the research hotspots in many disciplines. The subwavelength metal array structure has important scientific research and application value in the field of terahertz wave transmission control. In order to better explore the functional devices based on terahertz wave subwavelength structure, In this paper, the double-layer sub-wavelength metal array structures with different structures are studied, the transmission characteristics are simulated and analyzed, the experiments and tests are carried out, and the electronic controlled tunable devices based on liquid crystal materials are designed. The main contents are as follows: the F-band monolayer ring metal subwavelength array structure, double hole and double layer (circular and square) ring metal subwavelength array structure are designed. Through numerical simulation, the structural parameters such as the diameter of metal hole, the thickness of metal and the thickness of quartz are optimized, and the influence of incident angle and period dislocation on transmission characteristic is analyzed. The transmission bandwidth is 33GHz and the maximum transmittance is 91. At the same time, the double-layer circular and square ring metal array samples with 50 脳 50 and 40 脳 40 arrays with side length of 4cm are fabricated, and the transmission characteristics are tested. The actual transmittance is less than 10% of the simulated data. The error and other factors in the experiment are analyzed and summarized. A terahertz modulator based on liquid crystal material and double metal circular hole array is designed. By adjusting the dielectric constant of the liquid crystal, the modulation depth of 91.3% of the electromagnetic wave is achieved at 340GHz. By analyzing the transmission characteristics of the array at different incident angles, it is found that the amplitude of oblique incident electromagnetic field can still be modulated effectively when the electric field vector is parallel to the metal surface. The simulation results show that the above structure can be applied to terahertz free space transmission system.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O441.4
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5 吴r，
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