International Journal of Heat and Mass Transfer· 2026Q1
Asymmetric and nonreciprocal thermal radiation with tailored angular range in width-perturbation nonlocal gratings
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- Q1SCImago
- 2026year
Short summary
A novel magneto-optical asymmetric (nonlocal) nano-grating design enables precise control over directional thermal emission, achieving asymmetric emission in reciprocal systems and a highly responsive unidirectional nonreciprocal effect in nonreciprocal systems with tunable angular ranges.
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Key points
- Designed supercells with gradient grating width achieve asymmetric thermal emission in reciprocal systems.
- Coupled mode theory explains and allows tuning of dispersion in reciprocal systems.
- A novel unidirectional nonreciprocal thermal radiation effect is induced in nonreciprocal systems.
- The nonreciprocal effect offers a tunable and quantitative angular range through high-order diffraction.
AI-generated from the title and abstract; the full text is not read.
Abstract
Precise manipulation of directional thermal emission is crucial for advanced thermal management and energy conversion systems. However, traditional periodic structures suffer from inherent symmetry limitations, restricting the spatial freedom of thermal emission control in both reciprocal and nonreciprocal systems. Herein, we extend the asymmetric thermal emission from reciprocal to nonreciprocal systems using magneto-optical asymmetric (nonlocal) nano-gratings to further decouple the correlation between absorptivity and emissivity. In reciprocal systems, designed supercell with gradient grating width achieve asymmetric thermal emission and the dispersion can be flexibly tuned through coupled mode theory. Extended to nonreciprocal system, a novel unidirectional nonreciprocal effect is further induced by the asymmetric supercell. A highly responsive unidirectional nonreciprocal thermal radiation with a tunable and quantitative angular range through high-order diffraction can be achieved. This work provides a viable strategy for novel and high-precision directional nonreciprocal thermal emission control, promising applications in advanced energy harvesting.
The authors' abstract, as published at the source. International Journal of Heat and Mass Transfer, 2026 · DOI ↗
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Field: Civil and Structural Engineering
Civil and Structural EngineeringEngineering