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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 6 — Mar. 15, 2010
  • pp: 5525–5540

High performance solar-selective absorbers using coated sub-wavelength gratings

Nicholas P. Sergeant, Mukul Agrawal, and Peter Peumans  »View Author Affiliations

Optics Express, Vol. 18, Issue 6, pp. 5525-5540 (2010)

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Spectral control of the emissivity of surfaces is essential for efficient conversion of solar radiation into heat. We investigated surfaces consisting of sub-wavelength V-groove gratings coated with aperiodic metal-dielectric stacks. The spectral behavior of the coated gratings was modeled using rigorous coupled-wave analysis (RCWA). The proposed absorber coatings combine impedance matching using tapered metallic features with the excellent spectral selectivity of aperiodic metal-dielectric stacks. The aspect ratio of the V-groove can be tailored in order to obtain the desired spectral selectivity over a wide angular range. Coated V-groove gratings with optimal aspect ratio are predicted to have thermal emissivity below 6% at 720K while absorbing >94% of the incident light. These sub-wavelength gratings would have the potential to significantly increase the efficiency of concentrated solar thermal systems.

© 2010 OSA

OCIS Codes
(310.1620) Thin films : Interference coatings
(350.6050) Other areas of optics : Solar energy
(310.3915) Thin films : Metallic, opaque, and absorbing coatings
(310.4165) Thin films : Multilayer design

ToC Category:
Solar Energy

Original Manuscript: December 14, 2009
Revised Manuscript: February 27, 2010
Manuscript Accepted: February 28, 2010
Published: March 3, 2010

Virtual Issues
Focus Issue: Solar Concentrators (2010) Optics Express

Nicholas P. Sergeant, Mukul Agrawal, and Peter Peumans, "High performance solar-selective absorbers using coated sub-wavelength gratings," Opt. Express 18, 5525-5540 (2010)

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