Design of an achromatic zoom metalens doublet in the visible

TL;DR

This paper presents a numerically designed broadband achromatic zoom metalens doublet in the visible spectrum, capable of continuous 1-10x zoom with high efficiency, overcoming chromatic aberration limitations of prior designs.

Contribution

The authors introduce a globally optimized design method for a broadband achromatic zoom metalens doublet that operates across multiple wavelengths in the visible range.

Findings

Achieves continuous 1-10x zoom range at 440, 540, and 640 nm

High focusing efficiency up to 86.5%

Polarization insensitivity

Abstract

Zoom metalens doublet exhibits unprecedented advantages over the traditional zoom lens in many aspects, like ultra-compactness, CMOS compatibility, and miniaturization. However, most of them can only work in a narrow band due to chromatic aberration. Here, we numerically demonstrate a broadband achromatic zoom metalens doublet inspired by the Moir\'e lens principle. This design is achieved by globally optimizing the multi-wavelength phase profiles of the metalens doublet in the visible. The doublet can achieve achromatic continuous 1-10 zoom range at wavelengths of 440 nm, 540 nm, and 640 nm, featuring high focusing efficiency up to 86.5% and polarization insensitivity.