非对称型Kerr类介质膜漏波导中的非线性导波

本文研究了特定边界条件下非对称型Kerr类介质膜漏波导中TE₀光波的传播特性。计算结果表明,介质膜厚存在一临界值。临界值之上没有导波存在,临界值之下能同时存在强场TE₀模和弱场TE₀模,它们具有不同的传播波数。这两个模的膜内传播功率、场强峰值位置随膜厚和光场频率的变化各不相同,色散关系也有极大差别。在对称极限之下,弱场TE₀模的色散为零。 关键词：

NONLINEAR GUIDED WAVE IN ASYMMETRIC KERR-TYPE DIELECTRIC FILM LEAKY WAVEGUIDE

The propagation characteristics of TE₀ modes is studied in an asymmetric leaky waveguide of Kerr-type dielectric film under certain boundary condition. Our result shows that steady guided wave cannor exist if the film thickness is greater than a critical value, and two TE₀ modes with different wave numbers may exist if the film thickness is less than that critical value. The propagating powers and the positions of the field amplitude peaks of these two modes in the film vary quite differently when the film thickness or the wave frequency changes. The dispersion relations of these two modes are also different. In the limit of symmetric structure, the dispersion of the weaker TE₀ mode is zero.