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Direct observation of surface mode excitation and slow light coupling in photonic crystal waveguides

机译:直接观察光子晶体波导中的表面模式激发和慢光耦合

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摘要

A scanning near-field optical microscope (SNOM) is used to systematically study the properties of guided modes in linear and slow-light regimes of silicon-on-insulator (SOI)-based photonic crystal waveguides (PhCWs) with different terminations of the photonic lattice. High quality SNOM images are obtained for light at telecom wavelengths propagating in the PhCW, demonstrating directly, for the first time to our knowledge, drastic widening of the PhCW guided mode in the slow-light regime and excitation of surface waves at the PhCW interface along with their feeding into the guided mode for the lattice terminations corresponding to significantly reduced coupling loss.
机译:扫描近场光学显微镜(SNOM)用于系统地研究具有不同光子终端的基于绝缘体上硅(SOI)的光子晶体波导(PhCW)的线性和慢光状态下的导模特性格子。对于在PhCW中传播的电信波长的光,可以获得高质量的SNOM图像,这是我们第一次直接了解到,在慢光条件下,PhCW引导模式的急剧扩展以及沿PhCW界面沿表面波的激发通过将其馈入晶格终端的导引模式,可大大降低耦合损耗。

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