Causality and instability in wave propagation in random time-varying media
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866912918357934080 |
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| author | Pierrat, Romain Rocha, Julia Carminati, Rémi |
| author_facet | Pierrat, Romain Rocha, Julia Carminati, Rémi |
| contents | We develop a theoretical model to investigate wave propagation in media with random time-varying properties, where temporal fluctuations lead to complex scattering dynamics. Focusing on the ensemble-averaged field, we derive an exact expression for the average Green's function in the presence of finite temporal disorder, and extend the analysis to the thermodynamic limit. In contrast to spatial disorder, causality prevents recurrent scattering, allowing us to achieve a non-perturbative solution. We introduce an effective medium description providing a simple analysis of the propagation regimes. Our findings offer new insights into wave dynamics in temporally disordered media, with potential applications in time-varying metamaterials, dynamic sensing, and imaging in turbulent or chaotic environments. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_18576 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Causality and instability in wave propagation in random time-varying media Pierrat, Romain Rocha, Julia Carminati, Rémi Optics Disordered Systems and Neural Networks We develop a theoretical model to investigate wave propagation in media with random time-varying properties, where temporal fluctuations lead to complex scattering dynamics. Focusing on the ensemble-averaged field, we derive an exact expression for the average Green's function in the presence of finite temporal disorder, and extend the analysis to the thermodynamic limit. In contrast to spatial disorder, causality prevents recurrent scattering, allowing us to achieve a non-perturbative solution. We introduce an effective medium description providing a simple analysis of the propagation regimes. Our findings offer new insights into wave dynamics in temporally disordered media, with potential applications in time-varying metamaterials, dynamic sensing, and imaging in turbulent or chaotic environments. |
| title | Causality and instability in wave propagation in random time-varying media |
| topic | Optics Disordered Systems and Neural Networks |
| url | https://arxiv.org/abs/2410.18576 |