Lang, SlawaSlawaLangTschikin, MariaMariaTschikinBiehs, Svend-AgeSvend-AgeBiehsPetrov, Alexander Yu.Alexander Yu.PetrovEich, ManfredManfredEich2021-07-292021-07-292014-03-24Appl. Phys. Lett. 104 (12): 121903 (2014)http://hdl.handle.net/11420/9996We compare super-Planckian thermal radiation between phonon-polaritonic media and hyperbolic metamaterials. In particular, we determine the penetration depth of thermal photons inside the absorbing medium for three different structures: two semi-infinite phonon-polaritonic media supporting surface modes, two multilayer hyperbolic metamaterials and two nanowire hyperbolic metamaterials. We show that for hyperbolic modes the penetration depth can be orders of magnitude larger than for surface modes suggesting that hyperbolic materials are much more preferable for near-field thermophotovoltaic applications than pure phonon-polaritonic materials.en1077-3118201412American Institute of PhysicsPhysics - Mesoscopic Systems and Quantum Hall EffectPhysics - Mesoscopic Systems and Quantum Hall EffectPhysikJournal Article10.1063/1.48694901403.5443v1Other