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arXiv physics/0312112physics.optics
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非对称双沟槽光子晶体波导中的模式混合

Mode mixing in asymmetric double trench photonic crystal waveguides

Yu. A. Vlasov, N. Moll, S. J. McNab

摘要:

从理论和实验两方面研究了一种新型的双沟槽波导的波导特性,这种波导是在绝缘体上硅(SOI)晶片上形成的二维光子晶体(PhC)平板中嵌入传统的单模条形波导。我们表明,相对低损耗(50 dB/cm)波导的带宽显着扩大到250 nm,几乎覆盖了所有的光子带隙,由于近线性色散的TE类波导模式。然而,平坦的透射光谱被许多窄阻带打断。我们发现,这些阻带可以归因于TE类(正宇称)和TM类(负宇称)模式之间的反交叉。这种效应是波导的强不对称性的直接结果,波导具有空气的上包层和氧化物的下包层。据我们所知,这是第一次演示的影响,包层不对称的传输特性的PhC平板波导。

英文摘要:

e investigate both experimentally and theoretically the waveguiding properties of a novel double trench waveguide where a conventional single-mode strip waveguide is embedded in a two dimensional photonic crystal (PhC) slab formed in silicon on insulator (SOI) wafers. We demonstrate that the bandwidth for relatively low-loss (50dB/cm) waveguiding is significantly expanded to 250nm covering almost all the photonic band gap owing to nearly linear dispersion of the TE-like waveguiding mode. The flat transmission spectrum however is interrupted by numerous narrow stop bands. We found that these stop bands can be attributed to anti-crossing between TE-like (positive parity) and TM-like (negative parity) modes. This effect is a direct result of the strong asymmetry of the waveguides that have an upper cladding of air and lower cladding of oxide. To our knowledge this is the first demonstration of the effects of cladding asymmetry on the transmission characteristics of the PhC slab waveguides.

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