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- Title
Heat transfer in photonic mirrors.
- Authors
Estrada-Wiese, D.; Río, J.; Mora, M.
- Abstract
The use of secondary mirrors in solar energy concentration is common. However, high concentrated solar radiation heats these mirrors thereby degrading their physical properties. In particular, aluminum mirrors melt because of high temperature due to storage by high radiative heat transfer. In contradistinction photonic crystals could present 'perfect reflection' and they can be fabricated using porous silicon which has a higher melting point than aluminum (porous silicon has a melting point higher than 900 K). Porous silicon is a nanostructured semiconductor material which can be fabricated with different porosities and refractive indices. Multilayers of alternating periodic refractive index conform the structure of these photonic crystals. The light that propagates in these structures interacts with its periodic refractive index that generates wavelength gaps of forbidden transmission and so these multilayers conform a mirror. Even these photonic structures are heated when they are exposed to high concentrated solar radiation. In this work we experimentally analyze this heating process and model it using an effective medium approach to explain the increasing temperature behavior.
- Subjects
PHOTONICS; HEAT transfer; SOLAR energy; SOLAR radiation; ALUMINUM; PHOTONIC crystals
- Publication
Journal of Materials Science: Materials in Electronics, 2014, Vol 25, Issue 10, p4348
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-014-2172-z