  In the present work, we theoretically demonstrate, for the first time, that
near field radiative transport between 1D periodic grating microstructures
separated by subwavelength vacuum gaps can be significantly enhanced by
exciting magnetic resonance or polariton. Fluctuational electrodynamics that
incorporates scattering matrix theory with rigorous coupled wave analysis is
employed to exactly calculate the near field radiative heat flux between two
SiC gratings. Besides the well known coupled surface phonon polaritons (SPhP),
an additional spectral radiative heat flux peak, which is due to magnetic
polariton, is found within the phonon absorption band of SiC. The mechanisms,
behaviors and interplays between magnetic polariton, coupled SPhP, single
interface SPhP, and Wood's anomaly in the near field radiative transport are
elucidated in detail. The findings will open up a new way to control near field
radiative heat transfer by magnetic resonance with micro or nanostructured
metamaterials.
