Multiwavelength Achromatic Metasurfaces by Dispersive Phase Compensation

TL;DR

This paper introduces a novel metasurface design that compensates for chromatic dispersion, enabling achromatic optical components that deflect multiple wavelengths without aberrations, advancing miniaturized optical systems.

Contribution

The work presents a dispersive phase compensation method using dielectric resonators to create achromatic metasurfaces for multiple wavelengths.

Findings

Achromatic deflection of three wavelengths achieved.

Planar lens without chromatic aberrations demonstrated.

Potential applications in lightweight optical devices.

Abstract

The replacement of bulk refractive optical elements with diffractive planar components enables the miniaturization of optical systems. However, diffractive optics suffers from large chromatic aberrations due to the dispersion of the phase accumulated by light during propagation. We show that this limitation can be overcome with an engineered wavelength-dependent phase shift imparted by a metasurface and demonstrate a design that deflects three wavelengths without dispersion. A planar lens without chromatic aberrations at three wavelengths is also presented. Our design is based on low-loss dielectric resonators which introduce a dense spectrum of optical modes to enable dispersive phase compensation. The suppression of chromatic aberrations in metasurface-based planar photonics will find applications in lightweight collimators for displays, and chromatically-corrected imaging systems.