  Although Epsilon-Near-Zero metamaterials (ENZ) offer many unconventional ways
to play with light, the optical impedance mismatch with surroundings can limit
the efficiency of future devices. We report here on the improvement of the
transmittance of an Epsilon-Near-Zero (ENZ) wavefront shaper. We first address
in this paper the way to enhance the transmittance of a plane wave through a
layer of ENZ material thanks to a numerical optimization approach based on the
Transfer Matrix Method. We then transpose the one dimensional approach to a two
dimensional case where the emission of a dipole is shaped into a plane wave by
an ENZ device with a design that optimizes the transmittance. As a result, we
demonstrate a transmittance efficiency of 15 \% that is 4 orders of magnitude
higher than previous devices proposed in the literature for wavefront shaping
applications. This work aims at paving the way for future efficient ENZ devices
by offering new strategies to optimize the transmittance through ENZ materials.
