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4 October 2023 Manipulating coherence of near-field thermal radiation in time-modulated systems
Renwen Yu, Shanhui Fan
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Proceedings Volume PC12647, Active Photonic Platforms (APP) 2023; PC126470S (2023) https://doi.org/10.1117/12.2676100
Event: SPIE Nanoscience + Engineering, 2023, San Diego, California, United States
Abstract
Controlling thermal emission is crucial for many applications, such as passive radiative cooling and solar thermophotovoltaic energy conversion. A key characteristics of thermal radiation is its coherence property. However, all existing studies on coherence properties of thermal radiation consider only passive systems. Here, we show that the spatial coherence of thermal radiation can be manipulated in time-modulated photonic systems supporting surface polaritons. We develop a fluctuational electrodynamics formalism for such systems to calculate the cross-spectral density tensor of the emitted thermal electromagnetic fields in the near-field regime. Our calculations indicate that, due to time-modulation, spatial coherence can be transferred between different frequencies, and correlations between different frequency components become possible. All these effects are unique to time-modulated systems. We also show that the decay rate of optical emitters can be controlled in the proximity of such time-modulated structure. Our findings open a promising avenue toward coherence control in thermal radiation, dynamical thermal imaging, manipulating energy transfer among thermal or optical emitters, efficient near-field radiative cooling, and engineering spontaneous emission rates of molecules.
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Renwen Yu and Shanhui Fan "Manipulating coherence of near-field thermal radiation in time-modulated systems", Proc. SPIE PC12647, Active Photonic Platforms (APP) 2023, PC126470S (4 October 2023); https://doi.org/10.1117/12.2676100
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KEYWORDS
Near field
Near field optics
Solar energy
Spatial coherence
Thermography
Molecules
Optical coherence
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