  In this work, we investigated graphene hypersurface (HSF) for the
manipulation of THz waves. The graphene HSF structure is consists of a periodic
array of graphene unit cells deposited on silicon substrate and terminated by a
metallic ground plane. The performance of the proposed HSF is numerically
analyzed. Electromagnetic parameters of HSF such as permeability, permittivity,
and impedance are studied. The proposed graphene HSF has active control over
absorption, reflection, and transmission of THz waves. The graphene HSF
provides perfect absorption, zero reflection and zero transmission at
resonance. Moreover, the graphene HSF structure has the advantage of anomalous
reflection and frequency reconfiguration. Incident waves can be reflected in
the desired direction, depending on the phase gradient of the HSF and the
perfect absorption is maintained at all reconfigurable frequencies upon
reconfiguration. The results reveal the effectiveness of the graphene HSF for
the manipulation of THz waves.
