arXiv 2110.044242021-10physics.opticsphysics.app-ph

用于电光可重构波前成形的高品质因数硅-锂超颖表面

High quality factor silicon-on-lithium niobate metasurfaces for electro-optically reconfigurable wavefront shaping

Elissa Klopfer, Sahil Dagli, David Barton, Mark Lawrence, Jennifer A. Dionne

DOI：: 10.1021/acs.nanolett.1c04723

摘要：

动态可重构的超表面为许多应用提供了紧凑和轻量级的空间光调制，包括LiDAR，AR/VR和LiFi系统。在这里，我们设计和计算研究高品质因数硅锂超颖表面与电驱动，独立控制其组成纳米棒的全相位可调谐性与高调谐效率。自由空间光通过周期性扰动耦合到每个纳米棒内的导模，产生超过30，000的品质因数，同时保持棒间距< $λ$ /1.5。我们实现了近2 $π$相位变化与施加的偏置不超过$\pm$ 25 V，保持反射效率高于91%。使用全场模拟，我们展示了一个高角度，51°，可切换的分束器，衍射效率为93%，和一个角度可调的光束转向器，跨越18-31°，效率高达86%，所有使用相同的元表面设备。我们的平台为高效波前整形设备提供了基础，该设备具有宽的动态调谐范围，能够产生几乎任何传递函数。

英文摘要：

Dynamically reconfigurable metasurfaces promise compact and lightweight spatial light modulation for many applications, including LiDAR, AR/VR, and LiFi systems. Here, we design and computationally investigate high quality factor silicon-on-lithium niobate metasurfaces with electrically-driven, independent control of its constituent nanobars for full phase tunability with high tuning efficiency. Free-space light couples to guided modes within each nanobar via periodic perturbations, generating quality factors exceeding 30,000, while maintaining bar spacing <$λ$/1.5. We achieve nearly 2$π$ phase variation with an applied bias not exceeding $\pm$ 25 V, maintaining reflection efficiency above 91%. Using full-field simulations, we demonstrate a high angle, 51°, switchable beamsplitter with a diffracted efficiency of 93%, and an angle-tunable beamsteerer, spanning 18-31°, with up to 86% efficiency, all using the same metasurface device. Our platform provides a foundation for highly efficient wavefront shaping devices with a wide dynamic tuning range capable of generating nearly any transfer function.

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英文摘要：

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