Broadband behavior of quadratic metalenses with a wide field of view

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 degrees and a bandwidth up to 140 nm operating at both 1300 nm and 1550 nm telecommunication wavelength bands.

Automated summary

Metalenses are a promising technology for implementing complex optical functionalities in planar and compact devices. This study investigates the broadband behavior of metalenses based on quadratic phase profiles. The results show that these metalenses have a large field of view and are tolerant to longitudinal and transverse chromatic aberrations. A single-layer silicon metalens with a field of view of 86 degrees and a bandwidth up to 140 nm operating at both 1300 nm and 1550 nm telecommunication wavelength bands is demonstrated.