  A broad range of imaging and sensing technologies in the infrared require
large Field-of-View (FoV) operation. To achieve this, traditional refractive
systems often employ multiple elements to compensate for aberrations, which
leads to excess size, weight, and cost. For many applications, including night
vision eye-wear, air-borne surveillance, and autonomous navigation for unmanned
aerial vehicles, size and weight are highly constrained. Sub-wavelength
diffractive optics, also known as meta-optics, can dramatically reduce the
size, weight, and cost of these imaging systems, as meta-optics are
significantly thinner and lighter than traditional refractive lenses. Here, we
demonstrate 80$^\circ$ FoV thermal imaging in the long-wavelength infrared
regime (8-12 $\mu$m) using an all-silicon meta-optic with an entrance aperture
and lens focal length of 1 cm.
