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arXiv 2002.12890physics.opticsphysics.app-ph
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用于彩色和偏振图像传感器的多功能体积元光学器件

Multi-functional volumetric meta-optics for color and polarization image sensors

Philip Camayd-Muñoz, Conner Ballew, Gregory Roberts, Andrei Faraon

摘要:

具有亚波长尺度结构化的折射率分布的三维元件提供了可用于演示多功能自由空间光学器件的广阔的光学设计空间。在这里,我们介绍了3D电介质元件,设计用于放置在图像传感器的像素顶部,根据其颜色和偏振对光进行分类和聚焦,其效率显着超过2D吸收和衍射滤波器。这些器件是通过基于迭代梯度的优化设计的,以考虑多个目标函数,同时确保与现有纳米纤维工艺的兼容性,并使用在微波频率下工作的缩放器件进行实验验证。这种方法将任意功能结合到一个单一的紧凑型元件中,即使在体光学中没有已知的等效元件,也可以实现新颖的集成光子应用。

英文摘要:

Three-dimensional elements, with refractive index distribution structured at sub-wavelength scale, provide an expansive optical design space that can be harnessed for demonstrating multi-functional free-space optical devices. Here we present 3D dielectric elements, designed to be placed on top of the pixels of image sensors, that sort and focus light based on its color and polarization with efficiency significantly surpassing 2D absorptive and diffractive filters. The devices are designed via iterative gradient-based optimization to account for multiple target functions while ensuring compatibility with existing nanofabrication processes, and experimentally validated using a scaled device that operates at microwave frequencies. This approach combines arbitrary functions into a single compact element even where there is no known equivalent in bulk optics, enabling novel integrated photonic applications.

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