標題: | Interaction Between Negative and Positive Index Medium Waveguides |
作者: | Yan, Wei Shen, Linfang Yuan, Yu Yang, Tzong Jer 電子物理學系 Department of Electrophysics |
關鍵字: | Backward waves;coupled mode theory;negative index media (NIM);waveguides |
公開日期: | 1-十一月-2008 |
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. |
URI: | http://dx.doi.org/10.1109/JLT.2008.917312 http://hdl.handle.net/11536/8196 |
ISSN: | 0733-8724 |
DOI: | 10.1109/JLT.2008.917312 |
期刊: | JOURNAL OF LIGHTWAVE TECHNOLOGY |
Volume: | 26 |
Issue: | 21-24 |
起始頁: | 3560 |
結束頁: | 3566 |
顯示於類別: | 期刊論文 |