| Original Articles |
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Transmission Loss due to Modes Conversion Caused by Random Surface Imperfections in Left-Handed-Material Slab Waveguides |
| ZHANG Gao-Ming;PENG Jing-Cui;JIAN Zhi-Jian;HUANG Xiao-Yi |
| Department of Applied Physics, Hunan University, Changsha 410082 |
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| Cite this article: |
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ZHANG Gao-Ming, PENG Jing-Cui, JIAN Zhi-Jian et al 2006 Chin. Phys. Lett. 23 1826-1829 |
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Abstract 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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| Keywords:
42.82.Et
41.20.Jb
42.70.Qs
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Published: 01 July 2006
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| PACS: |
42.82.Et
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(Waveguides, couplers, and arrays)
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41.20.Jb
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(Electromagnetic wave propagation; radiowave propagation)
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42.70.Qs
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(Photonic bandgap materials)
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