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研究一个芯子层是左手材料,其他三层由传统材料构成的四层平板光波导系统,利用图解法对各种TE偏振的导波模式的解进行详细分析。研究表明,四层左手材料光波导既能支持振荡导模,也能支持表面导模,与三层左手材料光波导相比较,此四层波导的导波模式呈现一些新的特性。对于中间传统材料层存在振荡场的情形:芯子层支持振荡导模的光波导中存在基模,并且高阶振荡导模出现模式缺失的性质;芯子层支持表面导模的光波导可以支持基模和多个高阶模式,并且存在模式兼并的性质。对于中间传统材料层存在衰减场的情形,此四层波导结构可等效为三层左手材料光波导。这些新的光波导传输性质对各种光波导器件的制作有潜在的应用价值。
In this paper, a four-layer slab optical waveguide system with a core layer of left-handed material and the other three layers of traditional materials is studied. The solutions of various guided modes with TE polarization are analyzed in detail. The research shows that the four-layer left-handed material optical waveguide supports both the oscillation guided mode and the surface guided mode. Compared with the three-layer left-handed material optical waveguide, the four-layer waveguide exhibits some new characteristics. For the case of the middle traditional material layer with oscillatory field, the fundamental mode exists in the optical waveguide supporting the oscillation guided mode in the core layer, and the modes of the high-order oscillation mode guide mode are missing. The optical waveguide supporting the surface mode guided by the core layer can support Fundamental mode and multiple higher order modes, and there is the nature of pattern mergence. For the case of an attenuation field in the middle traditional material layer, the four-layer waveguide structure is equivalent to a three-layer left-handed material optical waveguide. These new optical waveguide transmission properties of various optical waveguide devices have potential application value.