At the expense of frequency narrowing, binary amplitude-only diffractive optical elements emulate refractive
lenses without the need of large profiles. Unfortunately, they also present larger Fresnel reflection loss than
conventional lenses. This is usually tackled by implementing unattractive cumbersome designs. Here we
demonstrate that simplicity is not at odds with performance and we show how the fishnet metamaterial can
improve the radiation pattern of a Soret lens. The building block of this advanced Soret lens is the fishnet
metamaterial operating in the near-zero refractive index regime with one of the edge layers designed with
alternating opaque and transparent concentric rings made of subwavelength holes. The hybrid Soret fishnet
metalens retains all themeritsof classicalSoret lenses suchas lowprofile, lowcost andeaseofmanufacturing. It is
designed for the W-band of themillimeter-waves range with a subwavelength focal lengthFL51.58 mm(0.5l0)
aiming at a compact antenna or radar systems. The focal properties of the lens along with its radiation
characteristics in a lens antenna configuration have been studied numerically and confirmed experimentally,
showing a gain improvement of ,2 dB with respect to a fishnet Soret lens without the fishnet metamaterial.
