Fabrication of electro-magnetic sensor using electro-optic polymers

由于许多电气设备都会产生电磁辐射，电磁辐射影响人体健康，因此电磁传感器受到人们的特别关注。到目前为止，电磁传感器是用KIP等晶体材料制造的。电光聚合物具有较大的光电系数和可加工性，是一种很有前途的电磁传感材料。在这项研究中，我们专注于制造具有高EO效率和高热稳定性的新型EO聚合物。由于电磁传感器最好采用透明聚合物波导串联接枝的波导结构，我们采用可紫外光固化的环氧树脂作为被动聚合物波导制备了该波导。在各种非线性光学聚合物中，我们研究了一种含有由三硝基呋喃基团组成的受体与偶氮苯结构偶联的染料可以非常有效地增强光学非线性。为了获得热稳定的EO聚合物，我们使用聚芳醚作为染料的基质。我们还使用聚酰亚胺基eo聚合物作为热稳定的光波导。合成的含三氰呋喃受体eo聚合物具有良好的光学非线性，比标准的分散-红1附着聚合物的光学非线性大3倍。在近红外波长范围内，制备了eo聚合物和被动聚合物的串联接枝波导。综上所述，成功合成了新型eo聚合物，其光学非线性是标准eo聚合物的3倍左右。具有天线结构的eo聚合物串联接枝波导有望应用于电信波长区域的电磁场评价。

Electro-magnetic sensors are of special concern because so many electrical equipments induce electro-magnetic radiation and the radiation affects the health of human being. To date electro-magnetic sensors are fabricated using crystal materials such as KIP. Electro-optic (EO) polymers are promising materiall for electro-magnetic sensing applications because of their large EO coefficients and processability to make a sensing device. In this research we had focused on the fabrication of new EO polymers with high EO efficiencies as well as high thermal stability. Because electro-magnetic sensors should preferably be serially-grafted waveguide structure with transparent polymer waveguide, we have fabricated the waveguide using UV-curable epoxy resin as a passive polymer waveguide.Among a variety of nonlinear optical polymers we investigated the use of a dye containing an acceptor composed with tricyano furan group that was coupled with azobenzene structure was very effective to enhance optical nonlinearity. To obtain thermally stable EO polymers, we had used poly arylether as a matrix of the dye. We had also used polyimide base EO-polymers as a thermally stable optical waveguides.Synthesized EO-polymer with tricyano-containing furan acceptor had excellent optical nonlinearity, about 3 times larger than that of standard Disperse-Red 1 attached polymer. A serially-grafted waveguide of the EO-polymer and passive polymer was fabricated to apply them to electro-magnetic sensor in a near-IR wavelength region.In conclusion, new type of EO-polymers were successfully synthesized and about 3 times larger optical nonlinearity than that of standard EO-polymer was attained. The serially-grafted waveguide of the EO-polymer with antenna structure is expected to be applied for evaluating electro-magnetic field in telecommunication wavelength region.