Ko Myeong Ock, Kim Sung-Jo, Kim Jong-Hyun, Lee Bong Wan, Jeon Min Yong
Opt Express. 2014 Jun 30;22(13):16139-47. doi: 10.1364/OE.22.016139.
We demonstrate for the first time to our knowledge a dynamic measurement for an electric field sensor using a nematic liquid crystal (NLC) Fabry-Perot etalon and a wavelength-swept laser. It is well known that the wavelengths of the transmitted peaks of the NLC Fabry-Perot etalon depend on the applied electric field. The change in the effective refractive index of the NLC is measured according to the applied static electric field. The effective refractive index decreases from 1.67 to 1.51 as the applied the electric field intensity is increased. In addition, we measure the frequency of the dynamic variation in the electric field using a high-speed wavelength-swept laser. By measuring the modulation frequency of the transmitted peaks in the temporal domain, the frequency of the amplitude-modulated electric field can be estimated. The frequencies of the measured dynamic variations show a close agreement with the amplitude modulation frequencies of the induced electric field.
据我们所知，我们首次展示了一种使用向列型液晶（NLC）法布里-珀罗标准具和扫频激光器对电场传感器进行的动态测量。众所周知，NLC法布里-珀罗标准具透射峰的波长取决于所施加的电场。根据所施加的静电场测量NLC有效折射率的变化。随着所施加电场强度的增加，有效折射率从1.67降低到1.51。此外，我们使用高速扫频激光器测量电场动态变化的频率。通过在时域中测量透射峰的调制频率，可以估计幅度调制电场的频率。所测量的动态变化频率与感应电场的幅度调制频率显示出密切的一致性。
