  Electronic and transport properties of bilayer heterostructure under light
irradiation are of fundamental interest to improve functionality of
optoelectronic devices. We theoretically study the modification of transport
properties of bilayer graphene and bilayer heterostructures under a
time-periodic external light field. The bulk electronic and transport
properties are studied in a Landauer-type configuration by using the
nonequilibrium Green's function formalism. To illustrate the behavior of the
differential conductance of a bilayer contact under light illumination, we
consider tight-binding models of bilayer graphene and graphene/hexagonal
boron-nitride heterostructures. The non-adiabatic driving induces sidebands of
the original band structure and opening of gaps in the quasienergy spectrum. In
transport properties, the gap openings are manifested in a suppression of the
differential conductance. In addition to suppression, an external light field
induces an enhancement of the differential conductance if photoexcited
electrons tunnel into or out of a Van~Hove singularity.
