面向太赫兹应用的平面结构聚合物电光传感器

发布时间：2018-09-08 21:41

【摘要】：自由空间电光取样技术是太赫兹波(THz)相干探测的典型方法,电光传感器是其中的核心器件。传统的电光传感器多采用无机电光晶体材料,但是这种材料电光系数低并存在声子吸收性,致使太赫兹波的探测带宽受到限制。主-客体结构的电光聚合物材料具有较大的电光系数和较低的介电常数,近年来成为各国学者研究的热点。然而这种材料的主客体之间相容性差,极易产生相分离,导致电光性能降低,限制了材料的更广泛应用。采用一种化学与物理手段相结合的方法,将两种电光分子引入聚合物体系,制备了具有双电光分子的聚磷腈材料。这种材料不但具备良好的相稳定性,而且具有良好的电光性能,电光系数可达64.8 pm/V。基于双电光分子聚磷腈材料,设计并制作了具有平面结构的聚合物电光传感器。与传统的三明治结构电光传感器相比,平面结构传感器可以将探测幅度提升55%,光谱灵敏度提升35%,同时还可以避免入射角度对探测灵敏度的影响、降低噪声干扰、简化实验过程,是面向太赫兹应用的更适合器件。
[Abstract]:Free-space electro-optic sampling technique is a typical method for terahertz wave (THz) coherent detection, in which electro-optic sensor is the core device. The traditional electro-optic sensors mostly use inorganic electro-optic crystal materials, but this material has low electro-optic coefficient and phonon absorption, which limits the detection bandwidth of terahertz wave. Host-guest structure electro-optic polymer materials have a large electro-optic coefficient and a low dielectric constant, which has become a hot research topic in recent years. However, the compatibility between the host and the guest of the material is poor, and phase separation is easy to occur, which leads to the decrease of electro-optic properties and limits the wider application of the material. Two kinds of electro-optic molecules were introduced into polymer system by a combination of chemical and physical methods to prepare polyphosphazenitrile materials with double electro-optic molecules. This material not only has good phase stability, but also has good electro-optic properties. The electro-optic coefficient can reach 64.8 pm/V.. A planar polymer electro-optic sensor was designed and fabricated based on double electro optic polyphosphazene. Compared with the traditional sandwich structure electro-optic sensor, the planar structure sensor can increase the detection amplitude by 55 percent and the spectral sensitivity by 35 percent. At the same time, it can avoid the influence of the incident angle on the detection sensitivity, reduce the noise interference, and simplify the experimental process. It is a more suitable device for terahertz applications.
【作者单位】：哈尔滨理工大学电介质工程国家重点实验室培育基地;哈尔滨电工仪表研究所;
【基金】：国家自然科学基金(60871073) 哈尔滨市科技创新人才(2016RAQXJ025)项目资助
【分类号】：TP212

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