Servizzi A J, Boyd J T, Sriram S, Kingsley S A
Appl Opt. 1995 Jul 20;34(21):4248-55. doi: 10.1364/AO.34.004248.
To examine aspects of an integrated photonic electric-field sensor, we calculate electro-optically induced refractive-index change in regular and reverse-poled LiNbO(3). Specifically, for y-propagating extraordinary modes, we determine how index change depends on electric-field magnitude and direction. To accomplish this, changes in index-ellipsoid shape and orientation are found by the use of a numerical eigenvalue procedure to diagonalize the impermeability tensor; then, refractive index is calculated by the use of a vector reference-frame transformation and a small perturbation approximation. A general formula is inferred from calculations for specific field directions. Electro-optic coefficients for reversepoled LiNbO(3) are obtained by application of a tensor reference-frame transformation to those of LiNbO(3). The index-calculation procedure has utility beyond the problem that is considered.
为了研究集成光子电场传感器的各个方面，我们计算了常规极化和反向极化的LiNbO₃中电光诱导的折射率变化。具体而言，对于沿y轴传播的异常模式，我们确定折射率变化如何依赖于电场大小和方向。为了实现这一点，通过使用数值特征值程序对非渗透性张量进行对角化，来找到折射率椭球形状和方向的变化；然后，通过使用矢量参考系变换和小扰动近似来计算折射率。从特定场方向的计算中推断出一个通用公式。反向极化的LiNbO₃的电光系数是通过对LiNbO₃的电光系数应用张量参考系变换而获得的。折射率计算程序的用途超出了所考虑的问题。
