Highly-Efficient Selective Metamaterial Absorber for High-Temperature Solar Thermal Energy Harvesting
By Hao Wang, V. Sivan, Arnan Mitchell, Gary Rosengarten, Patrick E. Phelan, Liping Wang. 2014
277 citations recorded by the source corpus.
In this work, a metamaterial selective solar absorber made of nanostructured titanium gratings deposited on an ultrathin MgF2 spacer and a tungsten ground film is proposed and experimentally demonstrated. Normal absorptance of the fabricated solar absorber is characterized to be higher than 90% in the UV, visible and, near infrared (IR) regime, while the mid-IR emittance is around 20%. The high broadband absorption in the solar spectrum is realized by the excitation of surface plasmon and magnetic polariton resonances, while the low mid-IR emittance is due to the highly reflective nature of the metallic components. Further directional and polarized reflectance measurements show wide-angle and polarization-insensitive high absorption within solar spectrum. Temperature-dependent spectroscopic characterization indicates that the optical properties barely change at elevated temperatures up to 350{\deg}C. The solar-to-heat conversion efficiency with the fabricated metamaterial solar absorber is predicted to be 78% at 100{\deg}C without optical concentration or 80% at 400{\deg}C with 25 suns, and could be further improved with better fabrication processes and geometric optimization during metamaterial design. The strong spectral selectivity, favorable diffuse-like behavior, and excellent thermal stability make the metamaterial selective absorber promising for significantly enhancing solar thermal energy harvesting in various system at mid to high temperatures.
Subfields: Civil and Structural Engineering, Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials
View Paper: https://www.semanticscholar.org/paper/ba34a994238ecd1cc6957b4de702061ea8a94ad9
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Citations in the corpus
- Advances in central receivers for concentrating solar applications (2017, background): “Laser sintering, texturing, and the use of metamaterials to enhance solar absorptivity while reducing thermal emissivity have also been studied (Shah and Gupta, 2013; Shah et al., 2015; Wang et al., 2015).”