Christos Argyropoulos, Khai Q. Le, Nadia Mattiucci, Giuseppe D’Aguanno, and Andrea Alù
http://prb.aps.org/accepted/05070Yf8Lc61cb36442323938b3318674ea3f2929
We discuss the possibility of realizing utlrabroadband omnidirectional absorbers and angularly selective coherent thermal emitters based on properly patterned plasmonic metastructures. Instead of relying on resonant concentration effects that inherently limit the bandwidth, we base our design on the combination of two inherently nonresonant effects: plasmonic Brewster funneling and adiabatic plasmonic focusing. Using this approach, we propose compact, broadband absorption and emission spanning terahertz, infrared and optical frequencies, ideal for various energy and defense applications.
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