Abstract
We explore the near-field radiative thermal energy transfer properties of hyperbolic metamaterials. The presence of unique electromagnetic states in a broad bandwidth leads to super-planckian thermal energy transfer between metamaterials separated by a nano-gap. We consider practical phonon-polaritonic metamaterials for thermal engineering in the mid-infrared range and show that the effect exists in spite of the losses, absorption and finite unit cell size. For thermophotovoltaic energy conversion applications requiring energy transfer in the near-infrared range we introduce high temperature hyperbolic metamaterials based on plasmonic materials with a high melting point. Our work paves the way for practical high temperature radiative thermal energy transfer applications of hyperbolic metamaterials.
Highlights
Artificial media can support electromagnetic modes that do not occur in conventional materials making them attractive as building blocks for photonic devices [1]
One such application is thermal engineering where control over the spectral and angular width of thermal radiation along with emissivity can lead to multitude of applications in energy conversion [2], radiative heat transfer [3], thermal stamping [4] and thermal sinks [5]
We show that in the mid-infrared range phonon-polaritonic metamaterials using silicon carbide and silicon dioxide multilayers can lead to super-planckian heat transfer between hyperbolic metamaterials (h-MMs)
Summary
Artificial media can support electromagnetic modes that do not occur in conventional materials making them attractive as building blocks for photonic devices [1] One such application is thermal engineering where control over the spectral and angular width of thermal radiation along with emissivity can lead to multitude of applications in energy conversion [2], radiative heat transfer [3], thermal stamping [4] and thermal sinks [5]. For practical applications such as thermophotovltaics high temperature heat transfer in the near-infrared range is required This arises due to compatibility issues with low bandgap photovoltaic cells for energy conversion and increased device efficiency at higher temperatures [21]. This work paves the way for high temperature thermal engineering applications of hMMs
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