Please use this identifier to cite or link to this item:
https://elib.bsu.by/handle/123456789/291575
Title: | Bound States in the Continuum versus Fano Resonances: Topological Argument |
Authors: | Novitsky, Denis V. Novitsky, Andrey V. |
Keywords: | ЭБ БГУ::ЕСТЕСТВЕННЫЕ И ТОЧНЫЕ НАУКИ::Физика |
Issue Date: | 2022 |
Publisher: | MDPI |
Citation: | Photonics 2022, 9(11), 880 |
Abstract: | There is a recent surge of interest to the bound states in the continuum (BICs) due to their ability to provide high-quality resonances in open photonic systems. They are usually observed in perturbed systems possessing Fano resonances in their spectra. We argue that, generally speaking, the Fano resonances should not be considered as a proxy for BICs (as it is often done) due to their fundamentally different topological properties. This difference is illustrated with the non-Hermitian layered structure supporting both topologically nontrivial quasi-BIC and topologically trivial Fano resonances. Non-Hermiticity can also be a source of additional topological features of these resonant responses. Moreover, the lasing mode associated with BIC in this structure also possesses nonzero topological charge that can be useful for producing unconventional states of light. This paper contributes to the discussion of BIC physics and raises new questions concerning topological properties of non-Hermitian systems. |
URI: | https://elib.bsu.by/handle/123456789/291575 |
DOI: | 10.3390/photonics9110880 |
Sponsorship: | D.V.N. is grateful to the State Program for Scientific Research “Photonics and Electronics for Innovations” (Task 1.5). A.V.N. acknowledges the support of the Russian Science Foundation (Grant No. 21-12-00383) for calculation of reflection spectra. |
Licence: | info:eu-repo/semantics/openAccess |
Appears in Collections: | Кафедра физической оптики и прикладной информатики (статьи) |
Files in This Item:
File | Description | Size | Format | |
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Bound States in the Continuum versus Fano Resonances.pdf | 446,78 kB | Adobe PDF | View/Open |
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