| Transmission Loss due to Modes Conversion Caused by Random Surface Imperfections in Left-Handed-Material Slab Waveguides |
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| 作者姓名： | 张高明 彭景翠 翦知渐 黄小益 |
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| 作者单位： | Department of Applied Physics, Hunan University, Changsha 410082 |
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| 基金项目： | Supported by the Doctoral Programme Foundation of Institution of Higher Education of China under Grant No 20030532008. |
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| 摘 要： | Based on the orthogonality relations among the modes in left-handed-material （LHM） slab waveguides （SWGs）, we derive the coupled equations among the modes caused by imperfect surfaces, and compute the transmission loss due to mode conversion. The computation shows that the transmission loss is very large, which is due to three facts： （1） there exist slow waves in the LHM SWG, whose electric field is mainly distributed in the surface; （2） the absence of fundamental node-less modes, so the fundamental modes have a node, whose electric field is also mainly distributed in the surface, and （3） the different focusing effects of the random RHM and LHM imperfections cause the electric field to suffer from severe deformations aggravated by the electric field distribution of the guided wave and the slow wave, which of course dissipates the power carried by the guided wave more severely. Therefore, we can safely conclude that the LHM SWG is unsuitable for transmitting the fundamental modes with a node.
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| 关 键 词： | 传输损耗 模式转化 随机表面不完整性 正交关系 |
| 收稿时间： | 2005-12-30 |
| 修稿时间： | 2005-12-30 |
Transmission Loss due to Modes Conversion Caused by Random Surface Imperfections in Left-Handed-Material Slab Waveguides |
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| ZHANG Gao-Ming, PENG Jing-Cui, JIAN Zhi-Jian, HUANG Xiao-Yi.Transmission Loss due to Modes Conversion Caused by Random Surface Imperfections in Left-Handed-Material Slab Waveguides[J].Chinese Physics Letters,2006,23(7):1826-1829. |
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| Authors: | ZHANG Gao-Ming PENG Jing-Cui JIAN Zhi-Jian HUANG Xiao-Yi |
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