Fabrication of electro-magnetic sensor using electro-optic polymers

电磁传感器尤其受到关注，因为许多电气设备都会产生电磁辐射，而电磁辐射会影响人类的健康。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电光系数和可加工性，可用于制作传感器件，是一种很有前途的电磁传感材料。在这项研究中，我们致力于制备具有高EO效率和高热稳定性的新型EO聚合物。由于电磁波导宜采用串联接枝透明聚合物光波导结构，因此我们采用紫外光固化的环氧树脂作为无源聚合物光波导。在多种非线性光学聚合物中，我们研究了一种含有三氰基呋喃受体的染料与偶氮苯结构偶联，对提高光学非线性非常有效。为了获得热稳定的EO聚合物，我们使用了聚芳醚作为染料的基质。合成的含三氰基呋喃受体的聚酰亚胺基EO聚合物具有良好的光学非线性，约为标准分散红1附着型聚合物的3倍。制备了电光聚合物和无源聚合物的串联接枝光波导，并将其应用于近红外波段的电磁传感器，合成了新型电光聚合物，获得了比标准电光聚合物大约3倍的光学非线性。具有天线结构的EO聚合物串联接枝的光波导有望应用于通信波长区的电磁场计算。

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.