  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.
