Manipulating coherence of near-field thermal radiation in time-modulated systems

Abstract

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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Cited by in corpus (11)

• Time-modulated near-field radiative heat transfer
• Modulating near-field thermal transfer through temporal drivings: a quantum many-body theory
• Inverse-designed dispersive time-varying nanostructures
• Asymmetry-induced radiative heat transfer in Floquet systems
• Nanoscale Casimir Force Softening Originated from Quantum Surface Responses
• Near-field dynamical Casimir effect
• Many-Body Floquet Theory for Radiative Heat Transfer in Time-Modulated Systems
• Superconducting Coherence Peak in Near-Field Radiative Heat Transfer
• Time-dependent radiative heat flux after the beginning of thermal radiation
• Clarification of Floquet--Enhanced Thermal Emission Through the Nonequilibrium Green's Function Formalism
• Interference-Controlled Radiative Heat Transport in Time-Modulated Networks