Multipolar engineering of subwavelength dielectric particles for scattering enhancement
| Autor: | Krasikov, S. D., Odit, M. A., Dobrykh, D. A., Yusupov, I. M., Mikhailovskaya, A. A., Shakirova, D. T., Shcherbakov, A. A., Slobozhanyuk, A. P., Ginzburg, P., Filonov, D. S., Bogdanov, A. A. |
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| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Phys. Rev. Applied 15, 024052 (2021) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevApplied.15.024052 |
| Popis: | Electromagnetic scattering on subwavelength structures keeps attracting attention owing to abroad range of possible applications, where this phenomenon is in use. Fundamental limits of scattering cross-section, being well understood in spherical geometries, are overlooked in cases of low-symmetry resonators. Here, we revise the notion of superscattering and link this property with symmetry groups of the scattering potential. We demonstrate pathways to spectrally overlap several eigenmodes of a resonator in a way they interfere constructively and enhance the scattering cross-section. As a particular example, we demonstrate spectral overlapping of several electric and magnetic modes in a subwavelength entirely homogeneous ceramic resonator. The optimized structures show the excess of a dipolar scattering cross-section limit for a sphere up to a factor of four. The revealed rules, which link symmetry groups with fundamental scattering limits, allow performing and assessing designs of subwavelength supperscatterers, which can find a use in label-free imaging, compact antennas, long-range radio frequency identification, and many other fields. Comment: 9 pages, 5 figures |
| Databáze: | arXiv |
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