Topology of the near field in enhanced transmission through subwavelength apertures
Fuente:
arXiv
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| Autori principali: | , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866915684861083648 |
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| author | Ortiz-Ferreyro, MA Sumaya-Martinez, J. Esquivel-Navarrete, A. |
| author_facet | Ortiz-Ferreyro, MA Sumaya-Martinez, J. Esquivel-Navarrete, A. |
| contents | We analyze enhanced optical transmission through subwavelength apertures using a modal formulation for the two fundamental polarizations, transverse electric (TE) and transverse magnetic (TM). Within this framework, the fields inside the aperture are described in terms of guided modes whose excitation and interference govern the transmission process. By examining the near-field energy transport through the time-averaged Poynting vector, we show that resonant transmission is accompanied by a pronounced reorganization of the energy flow in the vicinity of the aperture. As the wavelength is varied across resonance, the energy transport undergoes a topological transition characterized by vortical and saddle-type flow structures, localized backflow regions, and efficient energy funneling through the aperture. These features correlate with strong phase gradients and phase singularities associated with the excited modal fields. The modal approach provides a unified and physically transparent interpretation of enhanced transmission in both slits and channels, applicable to perfect conductors and beyond plasmonic regimes. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_16785 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Topology of the near field in enhanced transmission through subwavelength apertures Ortiz-Ferreyro, MA Sumaya-Martinez, J. Esquivel-Navarrete, A. Optics We analyze enhanced optical transmission through subwavelength apertures using a modal formulation for the two fundamental polarizations, transverse electric (TE) and transverse magnetic (TM). Within this framework, the fields inside the aperture are described in terms of guided modes whose excitation and interference govern the transmission process. By examining the near-field energy transport through the time-averaged Poynting vector, we show that resonant transmission is accompanied by a pronounced reorganization of the energy flow in the vicinity of the aperture. As the wavelength is varied across resonance, the energy transport undergoes a topological transition characterized by vortical and saddle-type flow structures, localized backflow regions, and efficient energy funneling through the aperture. These features correlate with strong phase gradients and phase singularities associated with the excited modal fields. The modal approach provides a unified and physically transparent interpretation of enhanced transmission in both slits and channels, applicable to perfect conductors and beyond plasmonic regimes. |
| title | Topology of the near field in enhanced transmission through subwavelength apertures |
| topic | Optics |
| url | https://arxiv.org/abs/2512.16785 |