近红外单层大视场角超透镜研究

Research on the near-infrared single-layer metalens with large field-of-view

摘要:

大视场角透镜是成像系统的重要组成部分。为实现大视场角，传统光学中需要由多个镜片组成的透镜组来纠正不同入射光角度带来的像差。本文设计并制造了一种近红外超透镜，由分布在衬底两侧的单层超表面和金属光阑组成。该器件能够有效抑制像差，在940 nm波长下实现120°的广角成像。实验证明了所制造的器件在设计的视场角范围内具有良好的聚焦性能，平均实验聚焦效率为45%。

Abstract:

Large field-of-view (FOV) lens is an essential component in imaging systems. To realize the large FOV, conventional optics requires the combination of multiple lenses into a lens group to correct the aberration caused by different angles of incident light. In this paper, a near-infrared metalens is designed and fabricated, which consists of a single-layer metasurface and a metal aperture distributed on both sides of the substrate. The device can suppress aberration effectively and realize a 120° large FOV imaging at the wavelength of 940 nm. Experiments have demonstrated that the fabricated device exhibits good focusing performance within the designed FOV range, with an average experimental focusing efficiency of 45%.