Bloch Surface Waves in Open Fabry–Perot Microcavities
Thanks to the increasing availability of technologies for thin film deposition, all-dielectric structures are becoming more and more attractive for integrated photonics. As light–matter interactions are involved, Bloch Surface Waves (BSWs) may represent a viable alternative to plasmonic platforms, a...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-02-01
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| Series: | Micromachines |
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| Online Access: | https://www.mdpi.com/2072-666X/14/3/509 |
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| author | Niccolò Marcucci Tian-Long Guo Ségolène Pélisset Matthieu Roussey Thierry Grosjean Emiliano Descrovi |
| author_facet | Niccolò Marcucci Tian-Long Guo Ségolène Pélisset Matthieu Roussey Thierry Grosjean Emiliano Descrovi |
| author_sort | Niccolò Marcucci |
| collection | DOAJ |
| description | Thanks to the increasing availability of technologies for thin film deposition, all-dielectric structures are becoming more and more attractive for integrated photonics. As light–matter interactions are involved, Bloch Surface Waves (BSWs) may represent a viable alternative to plasmonic platforms, allowing easy wavelength and polarization manipulation and reduced absorption losses. However, plasmon-based devices operating at an optical and near-infrared frequency have been demonstrated to reach extraordinary field confinement capabilities, with localized mode volumes of down to a few nanometers. Although such levels of energy localization are substantially unattainable with dielectrics, it is possible to operate subwavelength field confinement by employing high-refractive index materials with proper patterning such as, e.g., photonic crystals and metasurfaces. Here, we propose a computational study on the transverse localization of BSWs by means of quasi-flat Fabry–Perot microcavities, which have the advantage of being fully exposed toward the outer environment. These structures are constituted by defected periodic corrugations of a dielectric multilayer top surface. The dispersion and spatial distribution of BSWs’ cavity mode are presented. In addition, the hybridization of BSWs with an A exciton in a 2D flake of tungsten disulfide (WS<sub>2</sub>) is also addressed. We show evidence of strong coupling involving not only propagating BSWs but also localized BSWs, namely, band-edge and cavity modes. |
| first_indexed | 2024-03-11T06:10:20Z |
| format | Article |
| id | doaj.art-78c26c39d38a477d9c37df034713bcf4 |
| institution | Directory Open Access Journal |
| issn | 2072-666X |
| language | English |
| last_indexed | 2024-03-11T06:10:20Z |
| publishDate | 2023-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Micromachines |
| spelling | doaj.art-78c26c39d38a477d9c37df034713bcf42023-11-17T12:41:49ZengMDPI AGMicromachines2072-666X2023-02-0114350910.3390/mi14030509Bloch Surface Waves in Open Fabry–Perot MicrocavitiesNiccolò Marcucci0Tian-Long Guo1Ségolène Pélisset2Matthieu Roussey3Thierry Grosjean4Emiliano Descrovi5Dipartimento di Scienza Applicata e Tecnologia, Politecnico di Torino, 10129 Torino, ItalyCenter for Photonics Sciences, Department of Physics and Mathematics, University of Eastern Finland, 80101 Joensuu, FinlandCenter for Photonics Sciences, Department of Physics and Mathematics, University of Eastern Finland, 80101 Joensuu, FinlandCenter for Photonics Sciences, Department of Physics and Mathematics, University of Eastern Finland, 80101 Joensuu, FinlandDepartment of Optics, FEMTO-ST Institute, UMR CNRS 6174, 25030 Besançon, FranceDipartimento di Scienza Applicata e Tecnologia, Politecnico di Torino, 10129 Torino, ItalyThanks to the increasing availability of technologies for thin film deposition, all-dielectric structures are becoming more and more attractive for integrated photonics. As light–matter interactions are involved, Bloch Surface Waves (BSWs) may represent a viable alternative to plasmonic platforms, allowing easy wavelength and polarization manipulation and reduced absorption losses. However, plasmon-based devices operating at an optical and near-infrared frequency have been demonstrated to reach extraordinary field confinement capabilities, with localized mode volumes of down to a few nanometers. Although such levels of energy localization are substantially unattainable with dielectrics, it is possible to operate subwavelength field confinement by employing high-refractive index materials with proper patterning such as, e.g., photonic crystals and metasurfaces. Here, we propose a computational study on the transverse localization of BSWs by means of quasi-flat Fabry–Perot microcavities, which have the advantage of being fully exposed toward the outer environment. These structures are constituted by defected periodic corrugations of a dielectric multilayer top surface. The dispersion and spatial distribution of BSWs’ cavity mode are presented. In addition, the hybridization of BSWs with an A exciton in a 2D flake of tungsten disulfide (WS<sub>2</sub>) is also addressed. We show evidence of strong coupling involving not only propagating BSWs but also localized BSWs, namely, band-edge and cavity modes.https://www.mdpi.com/2072-666X/14/3/509Bloch Surface Wavesstrong couplingTMD2D materials |
| spellingShingle | Niccolò Marcucci Tian-Long Guo Ségolène Pélisset Matthieu Roussey Thierry Grosjean Emiliano Descrovi Bloch Surface Waves in Open Fabry–Perot Microcavities Micromachines Bloch Surface Waves strong coupling TMD 2D materials |
| title | Bloch Surface Waves in Open Fabry–Perot Microcavities |
| title_full | Bloch Surface Waves in Open Fabry–Perot Microcavities |
| title_fullStr | Bloch Surface Waves in Open Fabry–Perot Microcavities |
| title_full_unstemmed | Bloch Surface Waves in Open Fabry–Perot Microcavities |
| title_short | Bloch Surface Waves in Open Fabry–Perot Microcavities |
| title_sort | bloch surface waves in open fabry perot microcavities |
| topic | Bloch Surface Waves strong coupling TMD 2D materials |
| url | https://www.mdpi.com/2072-666X/14/3/509 |
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