  We demonstrate the possibility of achieving enhanced frequency-selective
near-field radiative heat transfer between patterned (photonic crystal) slabs
at designable frequencies and separations, exploiting a general numerical
approach for computing heat transfer in arbitrary geometries and materials
based on the finite-difference time-domain method. Our simulations reveal a
tradeoff between selectivity and near-field enhancement as the slab--slab
separation decreases, with the patterned heat transfer eventually reducing to
the unpatterned result multiplied by a fill factor (described by a standard
proximity approximation). We also find that heat transfer can be further
enhanced at selective frequencies when the slabs are brought into a
glide-symmetric configuration, a consequence of the degeneracies associated
with the non-symmorphic symmetry group.
