  We report on the preparation of flexible polymer composite films with aligned
metallic fillers comprised of atomic chain bundles of the quasi-one-dimensional
(1D) van der Waals material tantalum triselenide, TaSe3. The material
functionality, embedded at the nanoscale level, is achieved by mimicking the
design of an electromagnetic aperture grid antenna. The processed composites
employ chemically exfoliated TaSe3 nanowires as the grid building blocks
incorporated within the thin film. Filler alignment is achieved using the
"blade coating" method. Measurements conducted in the X-band frequency range
demonstrate that the electromagnetic transmission through such films can be
varied significantly by changing the relative orientations of the quasi-1D
fillers and the polarization of the electromagnetic wave. We argue that such
polarization-sensitive polymer films with quasi-1D fillers are applicable to
advanced electromagnetic interference shielding in future communication
systems.
