arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0808.3528physics.optics
收藏

负折射率和正折射率介质波导之间的相互作用

Interaction between negative and positive index medium waveguides

Wei Yan, Linfang Shen, Yu Yuan, Tzong Jer Yang

摘要:

本文从理论上研究了正折射率介质波导与负折射率介质波导之间的耦合。建立了这种波导系统的耦合模理论,并验证了其有效性。本文论证了负折射率介质波导在隔离状态下反向导模时耦合波导中的有趣现象。在两个波导的传播常数近似相等的特殊情况下,得到了一种随耦合长度呈指数变化的耦合模解。在这种情况下操作的耦合器对耦合长度不敏感,并且只要耦合长度足够长,其耦合效率可以达到100%。但是,当两个单独波导的传播常数相差很大时,耦合模解仍然是耦合长度的周期函数,但耦合功率是向后输出的。此外,还利用耦合模理论研究了复合波导系统中的模式,揭示了它们的基本性质。

英文摘要:

The coupling between negative and positive index medium waveguides is investigated theoretically in this paper. A coupled mode theory is developed for such a waveguide system and its validity is verified. Interesting phenomena in the coupled waveguides are demonstrated, which occur in the case when the negative index medium waveguide in isolation guides its mode backward. A new type of coupled mode solution that varies exponentially with the coupling length is found in the special case when the propagation constants of two individual waveguides are nearly the same. A coupler operating in this case is insensitive to the coupling length, and its coupling efficiency can reach 100% as long as the coupling length is long enough. However, when the propagation constants of the two individual waveguides differ greatly, the coupled mode solution is still a periodic function of the coupling length, but the coupled power is output backward. In addition, the modes in the composite waveguide system are also studied using the coupled mode theory, and their fundamental properties are revealed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑