Extended depth of focus (EDOF) optics can enable lower complexity optical imaging systems when compared to active focusing solutions. With existing EDOF optics, however, it is difficult to achieve high resolution and high collection efficiency simultaneously. The subwavelength spacing of scatterers in a meta-optic enables the engineering of very steep phase gradients; thus, meta-optics can achieve both a large physical aperture and a high numerical aperture. Here, we demonstrate a fast $(f/1.75)$ EDOF meta-optic operating at visible wavelengths, with an aperture of 2 mm and focal range from 3.5 mm to 14.5 mm (286 diopters to 69 diopters), which is a $250\times$ elongation of the depth of focus relative to a standard lens. Depth-independent performance is shown by imaging at a range of finite conjugates, with a minimum spatial resolution of $\sim 9.84\mathrm{\mu m}$ (50.8 cycles/mm). We also demonstrate operation of a directly integrated EDOF meta-optic camera module to evaluate imaging at multiple object distances, a functionality which would otherwise require a varifocal lens.

中文翻译：

---

用于变焦功能的快速扩展焦深超光学

与主动聚焦解决方案相比，扩展焦深 (EDOF) 光学器件可以实现更复杂的光学成像系统。然而，使用现有的 EDOF 光学器件，很难同时实现高分辨率和高收集效率。超光学中散射体的亚波长间隔使得能够设计非常陡峭的相位梯度；因此，超光学可以实现大物理孔径和高数值孔径。在这里，我们演示了一个快速$(F/1.75)$EDOF 超光学在可见光波长下工作，孔径为 2 毫米，焦距范围为 3.5 毫米至 14.5 毫米（286 至 69 屈光度），这是一种$250\times$相对于标准镜头的焦深延长。深度无关的性能通过在一系列有限共轭上成像来显示，最小空间分辨率为$～9.84\mathrm{微米}$（50.8 次/毫米）。我们还演示了直接集成的 EDOF 元光学相机模块的操作，以评估多个物距的成像，否则该功能需要变焦镜头。