中文摘要：

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。

英文摘要：

Electro-optic （EO） sensor is the core device for free space sampling technique. Conventional EO sensors are fabricated by inorganic crystal, whose EO coefficients are too low. This limits the detecting bandwidth of THz wave. Host-guest polymer possess higher EO coefficient and lower dielectric constant, which becomes the researching focus in related fields. However, phase separation often happens between the host polymer and the guest EO molecules, which leads to the properties decay. In this paper, two kinds of chromophoric groups are introduced into polymer main chains through a combination of chemical and physical methods. Polyphosphazene with double EO molecules, possessing not only high EO coefficient but also fine phasestability, is synthesized successfully and the EO coefficient of the product can be 64.8 pm/V under optimal conditions. Based on our product, a new kind of EO sensor with coplanar electrodes structure is designed and fabricated. On detecting the same THz wave, the amplitude of the new sensor can be enhanced by 50% and the sensibility by 50% compared with the conventional sandwich one. Meanwhile, the effect on detecting sensibility by incident angle can be avoided and the noise interference can be reduced, which makes the sensor with coplanar electrodes structure a more suitable device for THz applications.