Dynamic Control of Plasmonic Localization by Inverse Optimization of Spatial Phase Modulation
Dynamic Control of Plasmonic Localization by Inverse Optimization of Spatial Phase Modulation
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DOI：
10.1021/acsphotonics.1c01043
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发表时间：
2021-12-28
期刊：
影响因子：
7
通讯作者：
Chen, Wei
中科院分区：
文献类型：
--
作者：
Lee, Doksoo;Jiang, Shizhou;Chen, Wei
我们提出了一个系统的逆设计方法来实现数字可寻址等离子体元表面。除了现有的文献，我们采用了各种输入的相位分布来控制超颖表面上的局部光场分布。我们的逆向设计方法依赖于三个构建模块。首先，我们使用谐波函数的线性叠加来模拟入射场的空间相位分布，以生成平滑和灵活的相位分布。其次，我们提出了一个本地化计划，以量化的局部光场集中的超颖表面。第三，采用贝叶斯优化来学习潜在的非线性映射，并减少达到目标热点布置所需的数值模拟的数量。所获得的计算设计可以用空间光调制器来实现，以使得能够在没有机械扫描的情况下在元表面上动态地重新配置各种高对比度定位图案。先进的动态可寻址性可以推动相关应用超越概念验证演示。
We present a systematic inverse design approach to achieve digitally addressable plasmonic metasurfaces. Beyond existing literature, we adopt a variety of input phase profiles to control the local optical field distribution on the metasurface. Our inverse design approach relies on three building blocks. First, we model the spatial phase distribution of the incident field using a linear superposition of harmonic functions to generate smooth and flexible phase distributions. Second, we propose a localization scheme to quantify the local optical field concentration on the metasurface. Third, Bayesian optimization is employed to learn the underlying nonlinear mapping and to reduce the number of numerical simulations needed to reach the target hotspot arrangements. The obtained computational designs can be implemented with a spatial light modulator to enable dynamic reconfiguration of diverse high-contrast localization patterns on a metasurface without mechanical scanning. The advanced dynamic addressability could fuel relevant applications beyond proof-of-concept demonstrations.