Tunable wavelength selectivity of photonic metamaterials-based thermal devices

Yanpei Tian, Alok Ghanekar, Xiaojie Liu, Jie Sheng, Yi Zheng

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Wavelength-selective thermal devices have great applications in concentrating solar power systems, high-temperature thermoelectric systems, and solar thermophotovoltaics (STPVs). Lack of high-temperature stability and spectrally selective emissivity in different wavelength regions limits their efficiency. We propose a one-dimensional HfO 2 / Al 2 O 3 -W nanocomposites / W / Al 2 O 3 / W multilayered photonic structure as potential wavelength selective thermal devices, and theoretically investigate the emission properties of the proposed Mie-resonance metamaterials from visible (VIS) to midinfrared (MIR) region. HfO 2 thin layer is introduced to serve as an antireflection coating film and W layer acts as an IR reflection layer that enhances the absorptivity/emissivity in VIS and near-infrared (NIR) region while reducing the MIR emission simultaneously. Effects of geometric parameters are discussed, such as different radii and volume fractions of W nanoparticles, the thickness of Al 2 O 3 -W nanocomposites, and HfO 2 thin film. The proposed thermal absorber and emitter exhibit nearly unity absorptance in both VIS and NIR regions, while the emittance approaches zero in the MIR region. The selective absorption/emission window is tunable by varying geometric parameters. The proposed solar thermal devices have great potentials in engineering applications such as STPVs and solar thermoelectric generator due to flexibility of geometric parameters and ease of fabrication.
Original languageEnglish (US)
JournalJournal of Photonics for Energy
Volume9
Issue number3
DOIs
StatePublished - Jul 1 2019
Externally publishedYes

Bibliographical note

Generated from Scopus record by KAUST IRTS on 2023-09-23

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Atomic and Molecular Physics, and Optics

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