  We propose a method for engineering thermally excited far field
electromagnetic radiation using epsilon-near-zero metamaterials and introduce a
new class of artificial media: epsilon-near-pole metamaterials. We also
introduce the concept of high temperature plasmonics as conventional
metamaterial building blocks have relatively poor thermal stability. Using our
approach, the angular nature, spectral position, and width of the thermal
emission and optical absorption can be finely tuned for a variety of
applications. In particular, we show that these metamaterial emitters near 1500
K can be used as part of thermophotovoltaic devices to surpass the full
concentration Shockley-Queisser limit of 41%. Our work paves the way for high
temperature thermal engineering applications of metamaterials.
