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| Autori principali: | , , , |
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| Natura: | Preprint |
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2023
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| Accesso online: | https://arxiv.org/abs/2312.14393 |
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| _version_ | 1866913068169035776 |
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| author | Grynko, Yevgen Siebert, Dustin Sperling, Jan Förstner, Jens |
| author_facet | Grynko, Yevgen Siebert, Dustin Sperling, Jan Förstner, Jens |
| contents | We investigate light transport in three-dimensional disordered media composed of irregular dielectric particles using large scale full-wave simulations. For subwavelength particles with size parameter $kr \approx 1$ and high refractive index contrast, we observe a transition from diffusion to a regime characterized by non-exponential decay of time-resolved transmission as disorder increases. The corresponding time-dependent diffusion coefficient decreases with time and approaches a $t^{-1}$ scaling at long times. This dynamical slowdown is accompanied by the emergence of spectrally isolated transmission resonances with Thouless conductance below unity, indicating the dominance of long-lived modes with weak spectral overlap. The late time near-field maps reveal evolving, non-propagating clusters of intensity hotspots. Together, the transport, spectral, and near-field signatures provide consistent numerical evidence for Anderson localization of light in three-dimensional disordered dielectric media. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2312_14393 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | 3D Anderson localization of light in disordered systems of dielectric particles Grynko, Yevgen Siebert, Dustin Sperling, Jan Förstner, Jens Optics Computational Physics We investigate light transport in three-dimensional disordered media composed of irregular dielectric particles using large scale full-wave simulations. For subwavelength particles with size parameter $kr \approx 1$ and high refractive index contrast, we observe a transition from diffusion to a regime characterized by non-exponential decay of time-resolved transmission as disorder increases. The corresponding time-dependent diffusion coefficient decreases with time and approaches a $t^{-1}$ scaling at long times. This dynamical slowdown is accompanied by the emergence of spectrally isolated transmission resonances with Thouless conductance below unity, indicating the dominance of long-lived modes with weak spectral overlap. The late time near-field maps reveal evolving, non-propagating clusters of intensity hotspots. Together, the transport, spectral, and near-field signatures provide consistent numerical evidence for Anderson localization of light in three-dimensional disordered dielectric media. |
| title | 3D Anderson localization of light in disordered systems of dielectric particles |
| topic | Optics Computational Physics |
| url | https://arxiv.org/abs/2312.14393 |