Frequency-selective near-field enhancement of radiative heat transfer   via photonic-crystal slabs: a general computational approach for arbitrary   geometries and materials
  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. 
Alejandro W. Rodriguez, Ognjen Ilic, Peter Bermel, Ivan Celanovic,   John D. Joannopoulos, Marin Soljacic, and Steven G. Johnson
cond-mat.mtrl-sci