Broadband behavior of quadratic metalenses with a wide field of view

TL;DR

This paper experimentally studies quadratic phase profile metalenses, demonstrating their large field of view and inherent chromatic aberration tolerance, suitable for broadband telecommunication applications.

Contribution

It presents the first experimental analysis of broadband quadratic metalenses showing large FOV and aberration tolerance at telecommunication wavelengths.

Findings

Field of view of 86 degrees achieved

Bandwidth up to 140 nm demonstrated

Operates effectively at 1300 nm and 1550 nm

Abstract

Metalenses are attracting a large interest for the implementation of complex optical functionalities in planar and compact devices. However, chromatic and off-axis aberrations remain standing challenges. Here, we experimentally investigate the broadband behavior of metalenses based on quadratic phase profiles. We show that these metalenses do not only guarantee an arbitrarily large field of view but are also inherently tolerant to longitudinal and transverse chromatic aberrations. As such, we demonstrate a single-layer, silicon metalens with a field of view of 86{\deg} and a bandwidth up to 140 nm operating at both 1300 nm and 1550 nm telecommunication wavelength bands.