Dispersion effects in thermal emission from temporal metamaterials: High-frequency cut-offs
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arXiv
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| Auteurs principaux: | , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866913545098100736 |
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| author | Vertiz-Conde, Amaia Liberal, Iñigo Vázquez-Lozano, J. Enrique |
| author_facet | Vertiz-Conde, Amaia Liberal, Iñigo Vázquez-Lozano, J. Enrique |
| contents | The latest breakthroughs in time-varying photonics are fueling novel thermal emission phenomena, for example, showing that the dynamic amplification of quantum vacuum fluctuations, induced by the time-modulation of material properties, enables a mechanism to surpass the black-body spectrum. So far, this issue has only been investigated under the assumption of non-dispersive time-modulations. In this work, we identify the existence of a non-physical diverging behavior in the time-modulated emission spectra at high frequencies, and prove that it is actually attributed to the simplistic assumption of a non-dispersive (temporally local) response of the time-modulation associated with memory-less systems. Accordingly, we upgrade the theoretical formalism by introducing a dispersive response function, showing that it leads to a high-frequency cut-off, thereby eliminating the divergence and hence allowing for the proper computation of the emission spectra of time-modulated materials. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_10558 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Dispersion effects in thermal emission from temporal metamaterials: High-frequency cut-offs Vertiz-Conde, Amaia Liberal, Iñigo Vázquez-Lozano, J. Enrique Optics Mesoscale and Nanoscale Physics Applied Physics The latest breakthroughs in time-varying photonics are fueling novel thermal emission phenomena, for example, showing that the dynamic amplification of quantum vacuum fluctuations, induced by the time-modulation of material properties, enables a mechanism to surpass the black-body spectrum. So far, this issue has only been investigated under the assumption of non-dispersive time-modulations. In this work, we identify the existence of a non-physical diverging behavior in the time-modulated emission spectra at high frequencies, and prove that it is actually attributed to the simplistic assumption of a non-dispersive (temporally local) response of the time-modulation associated with memory-less systems. Accordingly, we upgrade the theoretical formalism by introducing a dispersive response function, showing that it leads to a high-frequency cut-off, thereby eliminating the divergence and hence allowing for the proper computation of the emission spectra of time-modulated materials. |
| title | Dispersion effects in thermal emission from temporal metamaterials: High-frequency cut-offs |
| topic | Optics Mesoscale and Nanoscale Physics Applied Physics |
| url | https://arxiv.org/abs/2410.10558 |