Optimization of radiative heat transfer in hyperbolic metamaterials for thermophotovoltaic applications Simovski, Constantin ; Maslovski, Stanislav ; Nefedov, Igor ; Tretyakov, Sergei Abstract Publication: Optics Express Pub Date: June 2013 DOI: 10.1364/OE.21.014988 Bibcode: 2013OExpr..2114988S