Design of mechanically robust metasurface lenses for RGB colors

TL;DR

This paper introduces a robust, broadband RGB metasurface lens design using a low refractive-index medium and interleaved frequency zones, enhancing stability and color manipulation capabilities for practical applications.

Contribution

It proposes a novel compound metasurface lens with improved robustness and bandwidth, enabling effective RGB color manipulation and structural stability in metasurface lenses.

Findings

Successfully demonstrated broadband RGB color manipulation

Enhanced structural robustness of metasurface lenses

Potential for practical applications in compact optical devices

Abstract

In recent years, dielectric rod based metasurface lenses have been particularly investigated for their potential applications in replacing the traditional bulky lens with high efficiency. However, the isolated granular structure may lead to robustness and chromatic aberration concerns. In this work, a low refractive-index embedding medium was applied to solve the structural stability problem that also enables the device to be transferable to desired position or surface. Based on this, a compound metasurface lens composed of randomly interleaved frequency-selective zone sectors is proposed to broaden the bandwidth of the two-dimensional device. The validities of the proposed method and the application potentials for the multifunctional lens that can manipulate RGB three colors have been numerically examined and verified. The current results are of essence in guiding the future design of metasurface lenses for real practice.