论文标题
两个平行纳米纤维的引导模式之间的耦合
Coupling between guided modes of two parallel nanofibers
论文作者
论文摘要
我们在分析和数值上研究了两个相同平行纳米纤维的基本指导模式之间的耦合。我们计算定向耦合，对接耦合和模式能量的系数随着光纤半径，光波长和纤维分离距离而变化。我们表明，由于系统的对称性，一种纳米纤维的模式与沿径向或切向轴对齐的主要准线性极化仅与其他纳米纤维的相应主偏振耦合。我们发现，当纤维半径较小，光波长很大，或者纤维分离距离很小时，对接耦合和模式能量变化对电源传递的影响很大。我们表明，当纤维半径，光波长或光纤分离距离变化时，功率传递系数可能会达到局部最大值，或者变为零，这表明该系统可用于距离或波长测量值。
We study the coupling between the fundamental guided modes of two identical parallel nanofibers analytically and numerically. We calculate the coefficients of directional coupling, butt coupling, and mode energy changes as functions of the fiber radius, the light wavelength, and the fiber separation distance. We show that, due to the symmetry of the system, a mode of a nanofiber with the principal quasilinear polarization aligned along the radial or tangential axis is coupled only to the mode with the same corresponding principal polarization of the other nanofiber. We find that the effects of the butt coupling and the mode energy changes on the power transfer are significant when the fiber radius is small, the light wavelength is large, or the fiber separation distance is small. We show that the power transfer coefficient may achieve a local maximum or become zero when the fiber radius, the light wavelength, or the fiber separation distance varies indicating the system could be used in metrology for distance or wavelength measurements.
