Temporal dynamics of Levy flights of photons in a hot vapor
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arXiv
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| Autores principales: | , , , , |
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| Formato: | Preprint |
| Publicado: |
2026
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| _version_ | 1866915875478568960 |
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| author | Filho, Ricardo V. M. de Almeida Carvalho, Joao C. de Aquino de Silans, Thierry Passerat de Miranda, Marcio H. G. Araújo, Michelle O. |
| author_facet | Filho, Ricardo V. M. de Almeida Carvalho, Joao C. de Aquino de Silans, Thierry Passerat de Miranda, Marcio H. G. Araújo, Michelle O. |
| contents | Multiple scattering of light by resonant vapor is characterized by Levy-type superdiffusion with a step size distribution $P(x) \propto 1/x^{1+α}$, with $0 < α < 2$. The Levy parameter $α$ was measured from $P(x)$, steady fluorescence, frequency-dependent fluorescence and time-resolved transmission, all of them in the forward direction. Here we report first measurements of this quantity from timeresolved backward fluorescence, i.e., photons that are backward diffused from light pulses exciting a hot rubidium vapor. We show experimentally that $α$ can be extracted from this diffuse reflection, and the results are consistent with time-resolved transmission (i.e., photons that are forward diffused) and steady frequency-dependent forward fluorescence. Theoretical simulations are consistent with these results. We also show that, although we measure $α = 1$ for both transmission and reflection, the backward photons have a non-negligible amount of single scattering events even for high density, contrary to the forward photons where multiple scattering dominates. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_18967 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Temporal dynamics of Levy flights of photons in a hot vapor Filho, Ricardo V. M. de Almeida Carvalho, Joao C. de Aquino de Silans, Thierry Passerat de Miranda, Marcio H. G. Araújo, Michelle O. Optics Atomic Physics Multiple scattering of light by resonant vapor is characterized by Levy-type superdiffusion with a step size distribution $P(x) \propto 1/x^{1+α}$, with $0 < α < 2$. The Levy parameter $α$ was measured from $P(x)$, steady fluorescence, frequency-dependent fluorescence and time-resolved transmission, all of them in the forward direction. Here we report first measurements of this quantity from timeresolved backward fluorescence, i.e., photons that are backward diffused from light pulses exciting a hot rubidium vapor. We show experimentally that $α$ can be extracted from this diffuse reflection, and the results are consistent with time-resolved transmission (i.e., photons that are forward diffused) and steady frequency-dependent forward fluorescence. Theoretical simulations are consistent with these results. We also show that, although we measure $α = 1$ for both transmission and reflection, the backward photons have a non-negligible amount of single scattering events even for high density, contrary to the forward photons where multiple scattering dominates. |
| title | Temporal dynamics of Levy flights of photons in a hot vapor |
| topic | Optics Atomic Physics |
| url | https://arxiv.org/abs/2603.18967 |