Tailoring photonic metamaterial resonances for thermal radiation
Author(s)Bermel, Peter A.; Ghebrebrhan, Michael; Harradon, Michael R.; Yeng, YiXiang; Celanovic, Ivan; Joannopoulos, John D.; Soljacic, Marin; ... Show more Show less
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Selective solar absorbers generally have limited effectiveness in unconcentrated sunlight, because of reradiation losses over a broad range of wavelengths and angles. However, metamaterials offer the potential to limit radiation exchange to a proscribed range of angles and wavelengths, which has the potential to dramatically boost performance. After globally optimizing one particular class of such designs, we find thermal transfer efficiencies of 78% at temperatures over 1,000°C, with overall system energy conversion efficiencies of 37%, exceeding the Shockley-Quiesser efficiency limit of 31% for photovoltaic conversion under unconcentrated sunlight. This represents a 250% increase in efficiency and 94% decrease in selective emitter area compared to a standard, angular-insensitive selective absorber.
DepartmentMassachusetts Institute of Technology. Institute for Soldier Nanotechnologies; Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science; Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Research Laboratory of Electronics
Nanoscale Research Letters
Bermel, Peter et al. “Tailoring photonic metamaterial resonances for thermal radiation.” Nanoscale Research Letters. 2011 Oct 06;6(1):549.
Author's final manuscript