Polarization-dependent mode coupling in hyperbolic nanospheres
Hyperbolic materials offer much wider freedom in designing optical properties of nanostructures than ones with isotropic and elliptical dispersion, both metallic or dielectric. Here, we present a detailed theoretical and numerical study on the unique optical properties of spherical nanoantennas comp...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
De Gruyter
2021-07-01
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| Series: | Nanophotonics |
| Subjects: | |
| Online Access: | https://doi.org/10.1515/nanoph-2021-0247 |
| _version_ | 1819115829211430912 |
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| author | Czajkowski Krzysztof M. Bancerek Maria Korneluk Alexander Świtlik Dominika Antosiewicz Tomasz J. |
| author_facet | Czajkowski Krzysztof M. Bancerek Maria Korneluk Alexander Świtlik Dominika Antosiewicz Tomasz J. |
| author_sort | Czajkowski Krzysztof M. |
| collection | DOAJ |
| description | Hyperbolic materials offer much wider freedom in designing optical properties of nanostructures than ones with isotropic and elliptical dispersion, both metallic or dielectric. Here, we present a detailed theoretical and numerical study on the unique optical properties of spherical nanoantennas composed of such materials. Hyperbolic nanospheres exhibit a rich modal structure that, depending on the polarization and direction of incident light, can exhibit either a full plasmonic-like response with multiple electric resonances, a single, dominant electric dipole or one with mixed magnetic and electric modes with an atypical reversed modal order. We derive conditions for observing these resonances in the dipolar approximation and offer insight into how the modal response evolves with the size, material composition, and illumination. Specifically, the origin of the magnetic dipole mode lies in the hyperbolic dispersion and its existence is determined by two diagonal permittivity components of different sign. Our analysis shows that the origin of this unusual behavior stems from complex coupling between electric and magnetic multipoles, which leads to very strong scattering or absorbing modes. These observations assert that hyperbolic nanoantennas offer a promising route towards novel light–matter interaction regimes. |
| first_indexed | 2024-12-22T05:07:24Z |
| format | Article |
| id | doaj.art-3db5688b3c4e4fca81322b22b24d8f26 |
| institution | Directory Open Access Journal |
| issn | 2192-8606 2192-8614 |
| language | English |
| last_indexed | 2024-12-22T05:07:24Z |
| publishDate | 2021-07-01 |
| publisher | De Gruyter |
| record_format | Article |
| series | Nanophotonics |
| spelling | doaj.art-3db5688b3c4e4fca81322b22b24d8f262022-12-21T18:38:04ZengDe GruyterNanophotonics2192-86062192-86142021-07-0110102737275110.1515/nanoph-2021-0247Polarization-dependent mode coupling in hyperbolic nanospheresCzajkowski Krzysztof M.0Bancerek Maria1Korneluk Alexander2Świtlik Dominika3Antosiewicz Tomasz J.4Faculty of Physics, University of Warsaw, Pasteura 5, Warsaw02-093, PolandFaculty of Physics, University of Warsaw, Pasteura 5, Warsaw02-093, PolandFaculty of Physics, University of Warsaw, Pasteura 5, Warsaw02-093, PolandFaculty of Physics, University of Warsaw, Pasteura 5, Warsaw02-093, PolandFaculty of Physics, University of Warsaw, Pasteura 5, Warsaw02-093, PolandHyperbolic materials offer much wider freedom in designing optical properties of nanostructures than ones with isotropic and elliptical dispersion, both metallic or dielectric. Here, we present a detailed theoretical and numerical study on the unique optical properties of spherical nanoantennas composed of such materials. Hyperbolic nanospheres exhibit a rich modal structure that, depending on the polarization and direction of incident light, can exhibit either a full plasmonic-like response with multiple electric resonances, a single, dominant electric dipole or one with mixed magnetic and electric modes with an atypical reversed modal order. We derive conditions for observing these resonances in the dipolar approximation and offer insight into how the modal response evolves with the size, material composition, and illumination. Specifically, the origin of the magnetic dipole mode lies in the hyperbolic dispersion and its existence is determined by two diagonal permittivity components of different sign. Our analysis shows that the origin of this unusual behavior stems from complex coupling between electric and magnetic multipoles, which leads to very strong scattering or absorbing modes. These observations assert that hyperbolic nanoantennas offer a promising route towards novel light–matter interaction regimes.https://doi.org/10.1515/nanoph-2021-0247hyperbolic dispersionmultipole decompositionnanoparticlest matrix |
| spellingShingle | Czajkowski Krzysztof M. Bancerek Maria Korneluk Alexander Świtlik Dominika Antosiewicz Tomasz J. Polarization-dependent mode coupling in hyperbolic nanospheres Nanophotonics hyperbolic dispersion multipole decomposition nanoparticles t matrix |
| title | Polarization-dependent mode coupling in hyperbolic nanospheres |
| title_full | Polarization-dependent mode coupling in hyperbolic nanospheres |
| title_fullStr | Polarization-dependent mode coupling in hyperbolic nanospheres |
| title_full_unstemmed | Polarization-dependent mode coupling in hyperbolic nanospheres |
| title_short | Polarization-dependent mode coupling in hyperbolic nanospheres |
| title_sort | polarization dependent mode coupling in hyperbolic nanospheres |
| topic | hyperbolic dispersion multipole decomposition nanoparticles t matrix |
| url | https://doi.org/10.1515/nanoph-2021-0247 |
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