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How planar optical waves can be made to climb dielectric steps

机译：如何使平面光波爬上电介质台阶

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摘要

We show how to optically connect guiding layers at different elevations in a 3-D integrated photonic circuit. Transfer of optical power carried by planar, semi-guided waves is possible without reflections or radiation losses, and over large vertical distances. This functionality is realized through simple step-like folds of high-contrast dielectric slab waveguides, in combination with oblique wave incidence, and fulfilling a resonance condition. Radiation losses vanish, and polarization conversion is suppressed for TE wave incidence beyond certain critical angles. This can be understood by fundamental arguments resting on a version of Snell's law. The two 90 degrees corners of a step act as identical partial reflectors in a Fabry Perot-like resonator setup. By selecting the step height, i.e., the distance between the reflectors, one realizes resonant states with full transmission. Rigorous quasi-analytical simulations for typical silicon/silica parameters demonstrate the functioning. Combinations of several step junctions can lead to other types of optical on-chip connects, e.g., U-turn- or bridge-like configurations. (C) 2015 Optical Society of America
机译：我们展示了如何在3-D集成光子电路中以光学方式连接不同高度的引导层。由平面的半导波传输的光功率有可能在没有反射或辐射损失的情况下并且在较大的垂直距离上传输。该功能是通过高对比度的介质平板波导的简单阶梯状折叠，结合斜波入射并满足共振条件来实现的。辐射损耗消失，并且对于超过特定临界角的TE波入射，偏振转换得到抑制。这可以通过基于斯涅尔定律的基本论点来理解。阶梯的两个90度角在Fabry Perot型谐振器设置中充当相同的部分反射器。通过选择台阶高度，即反射器之间的距离，可以实现全透射的共振状态。对典型的硅/二氧化硅参数进行严格的准分析模拟可证明其功能。多个阶梯结的组合可导致其他类型的片上光学连接，例如，U形转弯或桥状配置。 （C）2015年美国眼镜学会

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