Journal
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
Volume 38, Issue 2, Pages 327-335Publisher
Optica Publishing Group
DOI: 10.1364/JOSAB.411643
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- Indian Institute of Technology Guwahati [xEEESUGIITG01218xxDS001]
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The study presents an ultrabroadband perfect metamaterial absorber with an unprecedented average absorbance of around 99% in the 300 to 4500 nm spectral range. The design is polarization-independent and angle-insensitive, making it a potential candidate for thermophotovoltaics in solar energy harvesting.
We report an ultrabroadband perfect metamaterial absorber, comprising a two-dimensional array of a hemi-ellipsoid shaped metallo-dielectric multilayered structure. What we believe, to the best of our knowledge, is an unprecedented average absorbance of similar to 99% is theoretically demonstrated in the 300 to 4500 nm spectral range at normal incidence. We use 20 pairs of molybdenum-germanium metallo-dielectric layers with tungsten as the ground metal placed on a silicon substrate. Our design is polarization-independent as well as angle-insensitive (up to 60 degrees), making it a perfect superabsorber. Theoretical modeling based on effective medium theory validates our full-wave simulation results. The figure-of-merit calculations suggest that our superabsorber can outperform recently reported broadband absorbers. The proposed design has potential application in thermophotovoltaics for solar energy harvesting. (C) 2021 Optical Society of America
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