Carson R F, Batchman T E
Appl Opt. 1990 Jun 20;29(18):2769-80. doi: 10.1364/AO.29.002769.
Semiconductor-clad optical waveguides possess unique properties which arise from the periodic coupling effect between the lossless modes of the dielectric waveguide and the lossy modes which are supported by the thin semiconductor layer. This paper presents a detailed analysis of this mode structure showing mode conversion as a function of cladding thickness. The analysis predicts that several types of mode may exist for certain guide thicknesses, depending on the magnitude of the absorption in the semiconductor. The combined effects of waveguide coupling and loss are determined and illustrated in devices using silicon claddings.
半导体包覆光波导具有独特的特性，这些特性源于介质波导的无损模式与由薄半导体层支持的有损模式之间的周期性耦合效应。本文对这种模式结构进行了详细分析，展示了模式转换与包覆层厚度的函数关系。分析预测，对于某些特定的波导厚度，根据半导体中的吸收量大小，可能存在几种类型的模式。在使用硅包覆层的器件中确定并说明了波导耦合和损耗的综合影响。
