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Dispersion effects in thermal emission from temporal metamaterials: high-frequency cutoffs
Optics Letters
|February 14, 2025
Summary
Time-varying photonics can amplify quantum fluctuations beyond the blackbody spectrum. Introducing a dispersive response function corrects diverging high-frequency emission spectra in these dynamic thermal emission phenomena.
Area of Science:
- Photonics
- Quantum Optics
- Thermal Emission
Background:
- Time-varying photonics enable novel thermal emission phenomena by amplifying quantum vacuum fluctuations.
- Previous studies assumed non-dispersive time modulations, limiting theoretical understanding.
Purpose of the Study:
- To identify and address the non-physical diverging behavior in time-modulated emission spectra at high frequencies.
- To develop a more accurate theoretical formalism for dynamic thermal emission.
Main Methods:
- Investigated the assumption of non-dispersive time modulations.
- Introduced a dispersive response function into the theoretical formalism.
- Analyzed the high-frequency behavior of emission spectra.
Main Results:
- Identified a non-physical diverging behavior in emission spectra under non-dispersive assumptions.
- Demonstrated that this divergence stems from memory-less systems.
- Showed that a dispersive response function introduces a high-frequency cutoff, resolving the divergence.
Conclusions:
- The assumption of non-dispersive time modulation leads to unphysical results in dynamic thermal emission.
- A dispersive response function is crucial for accurately calculating emission spectra of time-modulated materials.
- This work enables proper computation of thermal emission beyond the blackbody limit in novel photonic systems.
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