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We compare super-Planckian thermal radiation between phonon-polaritonic mediaand hyperbolic metamaterials. In particular, we determine the penetration depthof thermal photons inside the absorbing medium for three different structures:two semi-infinite phonon-polaritonic media supporting surface modes, twomultilayer hyperbolic metamaterials and two nanowire hyperbolic metamaterials.We show that for hyperbolic modes the penetration depth can be orders ofmagnitude larger than for surface modes suggesting that hyperbolic materialsare much more preferable for near-field thermophotovoltaic applications thanpure phonon-polaritonic materials.

Large penetration depth of near-field heat flux in hyperbolic media