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Realizing symmetry-guaranteed pairs of bound states in the continuum in metasurfaces

Bound states in the continuum (BICs) have received significant attention for their ability to enhance light-matter interactions across a wide range of systems, including lasers, sensors, and frequency mixers. However, many applications require degenerate or nearly degenerate high-quality factor (Q)...

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Autores principales: Doiron, Chloe F., Brener, Igal, Cerjan, Alexander
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9729201/
https://www.ncbi.nlm.nih.gov/pubmed/36476952
http://dx.doi.org/10.1038/s41467-022-35246-w
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author Doiron, Chloe F.
Brener, Igal
Cerjan, Alexander
author_facet Doiron, Chloe F.
Brener, Igal
Cerjan, Alexander
author_sort Doiron, Chloe F.
collection PubMed
description Bound states in the continuum (BICs) have received significant attention for their ability to enhance light-matter interactions across a wide range of systems, including lasers, sensors, and frequency mixers. However, many applications require degenerate or nearly degenerate high-quality factor (Q) modes, such as spontaneous parametric down conversion, non-linear four-wave mixing, and intra-cavity difference frequency mixing for terahertz generation. Previously, degenerate pairs of bound states in the continuum (BICs) have been created by fine-tuning the structure to engineer the degeneracy, yielding BICs that respond unpredictably to structure imperfections and material variations. Instead, using a group theoretic approach, we present a design paradigm based on six-fold rotational symmetry (C(6)) for creating degenerate pairs of symmetry-protected BICs, whose frequency splitting and Q-factors can be independently and predictably controlled, yielding a complete design phase space. Using a combination of resonator and lattice deformations in silicon metasurfaces, we experimentally demonstrate the ability to tune mode spacing from 2 nm to 110 nm while simultaneously controlling Q-factor.
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spelling pubmed-97292012022-12-09 Realizing symmetry-guaranteed pairs of bound states in the continuum in metasurfaces Doiron, Chloe F. Brener, Igal Cerjan, Alexander Nat Commun Article Bound states in the continuum (BICs) have received significant attention for their ability to enhance light-matter interactions across a wide range of systems, including lasers, sensors, and frequency mixers. However, many applications require degenerate or nearly degenerate high-quality factor (Q) modes, such as spontaneous parametric down conversion, non-linear four-wave mixing, and intra-cavity difference frequency mixing for terahertz generation. Previously, degenerate pairs of bound states in the continuum (BICs) have been created by fine-tuning the structure to engineer the degeneracy, yielding BICs that respond unpredictably to structure imperfections and material variations. Instead, using a group theoretic approach, we present a design paradigm based on six-fold rotational symmetry (C(6)) for creating degenerate pairs of symmetry-protected BICs, whose frequency splitting and Q-factors can be independently and predictably controlled, yielding a complete design phase space. Using a combination of resonator and lattice deformations in silicon metasurfaces, we experimentally demonstrate the ability to tune mode spacing from 2 nm to 110 nm while simultaneously controlling Q-factor. Nature Publishing Group UK 2022-12-07 /pmc/articles/PMC9729201/ /pubmed/36476952 http://dx.doi.org/10.1038/s41467-022-35246-w Text en © The Author(s) 2022 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Doiron, Chloe F.
Brener, Igal
Cerjan, Alexander
Realizing symmetry-guaranteed pairs of bound states in the continuum in metasurfaces
title Realizing symmetry-guaranteed pairs of bound states in the continuum in metasurfaces
title_full Realizing symmetry-guaranteed pairs of bound states in the continuum in metasurfaces
title_fullStr Realizing symmetry-guaranteed pairs of bound states in the continuum in metasurfaces
title_full_unstemmed Realizing symmetry-guaranteed pairs of bound states in the continuum in metasurfaces
title_short Realizing symmetry-guaranteed pairs of bound states in the continuum in metasurfaces
title_sort realizing symmetry-guaranteed pairs of bound states in the continuum in metasurfaces
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9729201/
https://www.ncbi.nlm.nih.gov/pubmed/36476952
http://dx.doi.org/10.1038/s41467-022-35246-w
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