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arXiv 2212.01009physics.optics
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基于超表面的任意功率比自由空间多端口分束器

Metasurface-Based Free-Space Multi-port Beam Splitter with Arbitrary Power Ratio

Tian Tian, Yuxuan Liao, Xue Feng, Kaiyu Cui, Fang Liu, Wei Zhang, Yidong Huang

AI总结:

本文提出一种基于偏振无关全介质超表面的自由空间多端口分束器,通过梯度下降算法优化相位模式,实现任意功率比和输出方向,实验显示高效率和保真度。

摘要:

分束器(BS)是光学系统中最重要的基本元件之一。尽管已有多种平板型分束器尝试将传统立方体分束器小型化的报道,但实现具有多端口输出、非均匀分束比和可操控出射方向的超薄光学分束器仍然是一个挑战。在此,我们展示了一种基于偏振无关的全介质超表面的自由空间光学多端口分束器(MPBS)。通过采用基于梯度下降的迭代算法将优化的相位模式范式应用于非晶硅(a-Si)超表面,我们制备了多种具有任意预定输出端口数(2~7)、功率比和输出光束空间分布的MPBS样品。实验结果表明,所制备的MPBS在100 nm(1500~1600 nm)带宽内可实现高总分裂效率(TSE,高于74.7%)和分束保真度(相似度,高于78.4%)。我们预计这种MPBS可为光学集成系统和多样化应用提供极大的灵活性。

英文摘要:

A beam splitter (BS) is one of the most critical building blocks in optical systems. Despite various attempts of flat-type BSs to miniaturize the conventional cube BS reported, it remains a challenge to realize an ultrathin optical BS with multi-port output, non-uniform splitting ratio and steerable outgoing directions. Herein, we have demonstrated a free-space optical multi-port beam splitter (MPBS) based on a polarization-independent all-dielectric metasurface. By applying an optimized phase-pattern paradigm via a gradient-descent-based iterative algorithm to amorphous silicon (a-Si) metasurfaces, we have prepared a variety of MPBS samples with arbitrarily predetermined output port number (2~7), power ratio and spatial distribution of output beams. The experimental results reveal that the fabricated MPBSs could achieve high total splitting efficiency (TSE, above 74.7%) and beam-splitting fidelity (similarity, above 78.4%) within the bandwidth of 100 nm (1500~1600 nm). We envision that such MPBS could provide fabulous flexibility for optical integrated system and diverse applications.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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