  With the discovery of self-accelerating beams, possibility of obtaining
curved light beams in free space has been realized. These special beams paved
the way for many new applications as well as the exploration of novel beam
types. Recently, great research effort has been conducted to realize different
types of curved beams such as photonic hook and airy beam. These curved types
of beams are obtained by introducing structural asymmetry or applying
non-uniform dielectric distribution to the input and output face of the
structure. With this regard, we propose specially designed asymmetric structure
with polynomial back surface which generates curved light beams. Proposed
lossless dielectric structure can generate curved beams at frequencies varying
from 15.78 GHz to 20.09 GHz and corresponding curvature angles of minimum 41.34
and maximum 57.58 degrees, respectively. The physical background of the curved
beam formation is based on interference of the exiting light waves that
diffract on upper and bottom polynomial surfaces which provides phase
modulation leading to the curved trajectory of the propagating light. In
addition, the observed beam steering effect is further investigated and the
experimental verification in microwave region is conducted to verify our
design's operation principle.
