High temperature epsilon-near-zero and epsilon-near-pole metamaterial   emitters for thermophotovoltaics
  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. 
Sean Molesky, Christopher J. Dewalt, and Zubin Jacob
physics.optics cond-mat.mes-hall cond-mat.mtrl-sci