  We present an all-dielectric metadevice platform realized by combining an
inverse electromagnetic design computational method with additive
manufacturing. As opposed to conventional flat metasurface based devices that
are composed of resonant building blocks resulting in narrow band operation,
our design approach creates non-resonant, extremely broadband metadevices. We
propose and demonstrate high-efficiency (transmission > 60%), using thin
all-dielectric metadevices that are capable of polarization splitting, beam
bending, and focusing. Experimental demonstrations are performed at
millimeter-wave frequencies using 3D-printed metadevices, however our proposed
platform can be readily applied to the design and fabrication of
electromagnetic and photonic metadevices spanning microwave to optical
frequencies.
