Reverse Chromatic Aberration and its Numerical Optimization in a Metamaterial Lens

TL;DR

This paper demonstrates how to numerically control and optimize reverse chromatic aberration in metamaterial lenses by engineering phase shifters, enabling improved multi-distance focusing and potential applications in millimeter wave diagnostics.

Contribution

It introduces a numerical method to design metamaterial lenses with reverse chromatic aberration by optimizing phase shifter dimensions, a novel approach in lens engineering.

Findings

Lenses can be engineered to have focal length increase with frequency.

Numerical optimization achieves desired reverse chromatic aberration.

Potential applications in plasma diagnostics and multi-object focusing.

Abstract

In planar metamaterial lenses, the focal point moves with the frequency. Here it is shown numerically that this movement can be controlled by properly engineering the dimensions of the metamaterial-based phase shifters that constitute the lens. In particular, such lenses can be designed to exhibit unusual chromatic aberration with the focal length increasing, rather than decreasing, with the frequency. It is proposed that such an artificial "reverse" chromatic aberration may optimize the transverse resolution of millimeter wave diagnostics of plasmas and be useful in compensating for the natural "ordinary" chromatic aberration of other components in an optical system. More generally, optimized chromatic aberration will allow to simultaneously focus on several objects located at different distances and emitting or reflecting at different frequencies.