光学
反射(计算机编程)
材料科学
电介质
波长
数值孔径
衍射
光电子学
光圈(计算机存储器)
物理
计算机科学
程序设计语言
声学
作者
J. Basilio-Ortiz,Iván Moreno
出处
期刊:Optics Letters
[The Optical Society]
日期:2023-10-23
卷期号:48 (21): 5647-5647
摘要
While transmission-mode metalenses have been extensively studied, reflection-mode metalenses remain almost unexplored, presenting advantages in terms of improved efficiency and reduced complexity. In this Letter, we investigate a multilayer dielectric metalens operating in reflection mode at visible wavelengths without a metallic layer. Simulations and analysis demonstrate the performance of the metalens, with an 84% reflectivity the metalens proves its efficacy in reflection mode. At a numerical aperture of 0.15, the metalens achieves a 33% focusing efficiency, which is approximately twice that of similar reflective metalenses, facilitating efficient light manipulation and subwavelength resolution. Additionally, the metalens exhibits a well-defined focal spot with a full width at half maximum of 2.03 µm, approaching the diffraction limit.
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