STUDY ON WAVEGUIDE-TYPE ELECTRIC-FIELD SENSOR USING NONLINEAR POLYMER FOR PRECISELY MEASURING ELECTROMAGNETIC NOISES.

利用非线性聚合物精确测量电磁噪声的波导型电场传感器的研究。

• 批准号: 12831002
• 负责人: OKAMOTO Naomiti
• 金额: $ 2.37万
• 依托单位: SHIZUOKA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12831002/
• 关键词: Electric-field sensor; Electromagnetic wave noise; Broadband planar antenna; Polvmer optical modulator; 広帯域高分子光変調器; 電磁雑音パルス; 非線形高分子; 光導波形; 光変調器

Recently, accompanied with the popularization and the higher speed operation of electronic equipments as personal computers, electromagnetic wave noises with wide frequency range affect other electronic equipments and occasionally lead to mis-operation. We then study a wideband electric-field sensor to measure precisely the electromagnetic noises. The sensor is composed of a wideband planar small antenna and a wideband optical modulator using a nonlinear polymer.We analyze and design a small planar bow-tie antenna which is expected to be wideband. It is seen that the antenna has wider bandwidth than a planar dipole antenna, and it becomes the widest at a bow-tie angle of 90 deg. Furthermore, an antenna that each side opposite to the knot of the bow-tie change from, a straight line to an arc, has much wider bandwidth.We design an optical modulator in which the material of optical waveguide is the side-chain type nonlinear polymer,3RDCVXY with small wavelength dispersion, and the simple coplanar waveguide (CPW) is used. To make channel' waveguides with the photobleaching method, we measured the decrease in refractive index by uv exposure and confirmed that the decrement is stable with time. We could design the modulator with both the impedance matching and the velocity matching between the optical wave and the modulating microwave. As the result, we obtain the designed modulating bandwidth of 496 GHz at an interaction length of 2 cm.At this condition the bandwidth is decided only by the propagation loss of the CPW. We made the designed CPW and measured the loss. The measured loss is over 10 dB/cm at this time, and the large loss suggests a bandwidth of 30 GHz at an interaction length of 2 cm. We plan to improve the fabrication method and the propagation loss to go near the bandwidth to the designed one.

近年来，随着个人电脑等电子设备的普及和运行速度的提高，频率范围较宽的电磁波噪声会影响到其他电子设备，并偶尔导致误操作。然后，我们研究了一种宽带电场传感器来精确测量电磁噪声。该传感器由一个宽带平面小天线和一个采用非线性聚合物的宽带光调制器组成。我们分析和设计了一种小型平面领结天线，该天线有望实现宽带。可以看出，该天线的带宽比平面偶极子天线更宽，并且在90度的领结角处成为最宽的。此外，与领结结相对的每侧由直线变为弧形的天线具有更宽的带宽。本文设计了一种光调制器，其光波导材料为小波长色散的侧链型非线性聚合物3RDCVXY，采用简单共面波导（CPW）。为了用光漂白法制备通道波导，我们用紫外曝光法测量了折射率的下降，并证实了折射率随时间的下降是稳定的。我们可以设计出光波与调制微波的阻抗匹配和速度匹配的调制器。结果表明，在交互作用长度为2 cm时，我们获得了设计的调制带宽为496 GHz。在这种情况下，带宽仅由CPW的传播损耗决定。制作了设计的CPW并测量了损耗。此时测量的损耗超过10 dB/cm，大损耗表明在交互作用长度为2 cm时的带宽为30 GHz。我们计划改进制作方法和传输损耗，使其接近设计的带宽。

项目成果

T.Moriguchi,I Fukuda,H.Fujimura.,O.Sugihava,N.Okamoto,K.Izawa: "Wideband optical modulators using side-chained polymev"Joint Int.Conf.on Aduanced Science and Technology. 527-529 (2000)

T.Moriguchi、I Fukuda、H.Fujimura.、O.Sugihava、N.Okamoto、K.Izawa：“使用侧链聚合物的宽带光调制器”先进科学技术联合国际会议。