Enabling infinite Q factors in absorbing optical systems
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Journal Title
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Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2023-08-01
Major/Subject
Mcode
Degree programme
Language
en
Pages
3443–3454
Series
Nanophotonics, Volume 12, issue 17
Abstract
Resonant optical structures have widespread applications in science and technology. However, their quality (Q) factors can be significantly deteriorated, if some of their parts exhibit optical absorption. Here, we show that by coupling a lossy mode of such a structure to two independent lossless modes, one can create a nonradiating and absorption-free bound state in the continuum (BIC). The Q factor of such a BIC is theoretically unlimited despite interaction with an absorbing structure. We use this mechanism to design a plasmonic metasurface with Q factors that are close to 107 in the visible spectral range. The proposed mechanism is general and can be used to engineer ultrahigh-Q resonances in various systems containing absorbing structures.Description
Funding Information: Research funding: The authors acknowledge the support of the Research Council of Finland (Grants No. 347449 and 353758) and the Flagship of Photonics Research and Innovation (PREIN) funded by the Research Council of Finland (Grant No. 320167). For computational resources, the authors acknowledge the Aalto University School of Science “Science-IT” project and CSC – IT Center for Science, Finland. Publisher Copyright: © 2023 the author(s), published by De Gruyter, Berlin/Boston 2023.
Keywords
bound state in the continuum, optical absorption, resonant metasurface
Citation
Kolkowski , R & Shevchenko , A 2023 , ' Enabling infinite Q factors in absorbing optical systems ' , Nanophotonics , vol. 12 , no. 17 , pp. 3443–3454 . https://doi.org/10.1515/nanoph-2023-0281
