论文标题
用于颜色和极化图像传感器的多功能体积元视频
Multi-functional volumetric meta-optics for color and polarization image sensors
论文作者
论文摘要
三维元素，具有以次波长尺度结构的折射率分布，提供了一个宽敞的光学设计空间，可以利用该空间来展示多功能自由空间光学设备。在这里，我们提出了3D介电元件，旨在将其放置在图像传感器的像素顶部，这些元素根据其颜色和偏振效率分类和聚焦光，显着超过2D吸收性和衍射过滤器。这些设备是通过基于迭代梯度的优化设计的，以说明多个目标功能，同时确保与现有纳米化过程的兼容性，并使用以微波频率运行的缩放设备进行实验验证。这种方法将任意功能结合到单个紧凑的元素中，即使在散装光学中没有已知等效的情况下，可以实现新颖的集成光子应用。
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.
