Chiral and directional optical emission from a dipole source coupled to a helical plasmonic antenna
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arXiv
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| Hauptverfasser: | , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866911899642232832 |
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| author | Kuen, Lilli Löffler, Lorenz Tsarapkin, Aleksei Zschiedrich, Lin Feichtner, Thorsten Burger, Sven Höflich, Katja |
| author_facet | Kuen, Lilli Löffler, Lorenz Tsarapkin, Aleksei Zschiedrich, Lin Feichtner, Thorsten Burger, Sven Höflich, Katja |
| contents | Plasmonic antennas with helical geometry are capable transducers between linearly polarized dipole emission and purely circular polarized far-fields. Besides large Purcell enhancements they possess a wide tunability due to the geometry dependence of their resonant modes. Here, the coupling of a dipole emitter embedded in a thin film to plasmonic single and double helices is numerically studied. Using a higher-order finite element method (FEM) the wavelength dependent Purcell enhancement of a dipole with different positions and orientations is calculated and the far-fields with respect to their chirality and radiation patterns are analyzed. Both single and double helices demonstrate highly directional and circularly polarized far-fields for resonant excitation but with significantly improved directional radiation for the case of double helices. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_00664 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Chiral and directional optical emission from a dipole source coupled to a helical plasmonic antenna Kuen, Lilli Löffler, Lorenz Tsarapkin, Aleksei Zschiedrich, Lin Feichtner, Thorsten Burger, Sven Höflich, Katja Optics Plasmonic antennas with helical geometry are capable transducers between linearly polarized dipole emission and purely circular polarized far-fields. Besides large Purcell enhancements they possess a wide tunability due to the geometry dependence of their resonant modes. Here, the coupling of a dipole emitter embedded in a thin film to plasmonic single and double helices is numerically studied. Using a higher-order finite element method (FEM) the wavelength dependent Purcell enhancement of a dipole with different positions and orientations is calculated and the far-fields with respect to their chirality and radiation patterns are analyzed. Both single and double helices demonstrate highly directional and circularly polarized far-fields for resonant excitation but with significantly improved directional radiation for the case of double helices. |
| title | Chiral and directional optical emission from a dipole source coupled to a helical plasmonic antenna |
| topic | Optics |
| url | https://arxiv.org/abs/2402.00664 |