Uchida N, Mikami O, Uehara S, Noda J
Appl Opt. 1976 Feb 1;15(2):455-8. doi: 10.1364/AO.15.000455.
The change of optical field distribution by loading a high refractive-index film on a slab waveguide has been analyzed. It is found that the optical field is remarkably pulled to the film-waveguide boundary when the thickness of the loading film is close to the cutoff thickness. The optical energy content in the loading film has been calculated, and we have found that the energy existing in the film is easily made to be little (e.g., less than 10%) by the appropriate choice of the refractive index of the loading film. The effect is well utilized for the improvement of modulation efficiency in the waveguide modulator with planar-type electrodes.
分析了在平板波导上加载高折射率薄膜时光场分布的变化。发现当加载薄膜的厚度接近截止厚度时，光场会显著地被拉向薄膜 - 波导边界。计算了加载薄膜中的光能含量，并且我们发现通过适当选择加载薄膜的折射率，薄膜中存在的能量很容易变得很少（例如，小于10%）。这种效应被很好地用于提高具有平面型电极的波导调制器的调制效率。
