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arXiv 2008.02552physics.opticsphysics.app-ph
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紧凑高效的垂直发射硅光子微纳的设计

Design of Compact and Efficient Silicon Photonic Micro Antennas with Perfectly Vertical Emission

Daniele Melati, Mohsen Kamandar Dezfouli, Yuri Grinberg, Jens H. Schmid, Ross Cheriton, Siegfried Janz, Pavel Cheben, Dan-Xia Xu

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摘要：

紧凑高效的光学天线是许多应用的基础组件，包括高密度光纤芯片耦合和光学相控阵。在这里，我们提出了基于光栅的微天线的设计与完美的垂直发射在300纳米绝缘体上硅平台。我们利用结合伴随优化和机器学习降维的方法来有效地映射天线的多参数设计空间，分析大量相关的性能指标，进行所需的多目标优化，并发现高性能设计。采用一步切趾光栅，在3.6 μ m长的天线上实现了近92%的垂直向上衍射效率。当与超高数值孔径光纤耦合时，天线的耦合效率超过81%（-0.9 dB），1 dB带宽接近158 nm。由完全垂直天线产生的反射在以λ = 1550 nm为中心的200 nm带宽上小于-20 dB。

英文摘要：

Compact and efficient optical antennas are fundamental components for many applications, including high-density fiber-chip coupling and optical phased arrays. Here we present the design of grating-based micro-antennas with perfectly vertical emission in the 300-nm silicon-on-insulator platform. We leverage a methodology combining adjoint optimization and machine learning dimensionality reduction to efficiently map the multiparameter design space of the antennas, analyse a large number of relevant performance metrics, carry out the required multi-objective optimization, and discover high performance designs. Using a one-step apodized grating we achieve a vertical upward diffraction efficiency of almost 92% with a 3.6 μm-long antenna. When coupled with an ultra-high numerical aperture fiber, the antenna exhibits a coupling efficiency of more than 81% (-0.9 dB) and a 1-dB bandwidth of almost 158 nm. The reflection generated by the perfectly vertical antenna is smaller than -20 dB on a 200-nm bandwidth centered at λ = 1550 nm.

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