By capturing both the two-dimensional intensity and orientation information, the light-field camera is capable of generating depth information during the refocusing process. This technology holds great potential for applications in computational photography and computer vision. According to the imaging principle of microlens array light-field camera, this paper presents a design method for an light-field camera imaging system based on a metalens array. The method encompasses the overall design of the light-field camera imaging system as well as specific design considerations for the lens unit. Simulation and design results indicate that the optical system has the capability to achieve near-diffraction-limited imaging. The metalens units, which utilize the concentric nanorings structure, not only significantly reduce computational costs but also provide excellent achromatic imaging performance across the visible spectrum.
KEYWORDS: Design and modelling, Near field optics, Tunable filters, Incident light, Free space, Nanostructures, Electric fields, Near field, Visible radiation, Phase modulation
In this paper, we propose a novel reverse design method using topology optimization for the overall structure of a rotationally symmetric concentric nanoring metalens with a continuously variable height. The optimize objective is to maximize the focal field intensity of a predetermined numerical aperture lens. Compared to nano-pillar array structures and single thickness structures, this approach offers advantages in terms of high design flexibility in phase distribution and superior imaging performance. Leveraging the rotational symmetry inherent in concentric nanorings, a combined methodology of near-field electromagnetic simulations and far-field calculations is employed to verify the two-dimensional optical field characteristics. This method significantly improves computational efficiency compared to full-wave simulations in three-dimensional optical fields, as it reduces simulation time and has lower CPU requirements without compromising accuracy. The simulation results demonstrate that the designed continuous variable height concentric nanoring metalens achieves imaging close to the diffraction limit within the visible light range (400-700 nm).
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