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© 2023 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.

Abstract

Thanks to their long lifetime, spin-forbidden dark excitons in transition metal dichalcogenides are promising candidates for storage applications in opto-electronics and valleytronics. To date, their study has been hindered by inefficient generation mechanisms and the necessity for elaborate detection schemes. In this work, we propose a new hybrid platform that simultaneously addresses both challenges. We study an all-dielectric metasurface with two symmetrically protected quasi-bound states in the continuum to enhance both the excitation and emission of dark excitons in a tungsten diselenide monolayer under normal light incidence. Our simulations show a giant photoluminescence signal enhancement (∼520) along with directional emission, thus offering distinct advantages for opto-electronic and valleytronic devices.

Details

Title
Brightening and Directionality Control of Dark Excitons through Quasi-Bound States in the Continuum
Author
Klimmer, Sebastian 1   VIAFID ORCID Logo  ; Soavi, Giancarlo 2   VIAFID ORCID Logo  ; Staude, Isabelle 3   VIAFID ORCID Logo  ; Barreda, Ángela 4   VIAFID ORCID Logo 

 Institute of Solid State Physics, Friedrich Schiller University Jena, 07743 Jena, Germany; ARC Centre of Excellence for Transformative Meta-Optical Systems, Department of Electronic Materials Engineering, Research School of Physics, The Australian National University, Canberra, ACT 2601, Australia 
 Institute of Solid State Physics, Friedrich Schiller University Jena, 07743 Jena, Germany; Abbe Center of Photonics, Friedrich Schiller University Jena, 07745 Jena, Germany 
 Institute of Solid State Physics, Friedrich Schiller University Jena, 07743 Jena, Germany; Abbe Center of Photonics, Friedrich Schiller University Jena, 07745 Jena, Germany; Institute of Applied Physics, Friedrich Schiller University Jena, 07745 Jena, Germany 
 Institute of Solid State Physics, Friedrich Schiller University Jena, 07743 Jena, Germany; Abbe Center of Photonics, Friedrich Schiller University Jena, 07745 Jena, Germany; Institute of Applied Physics, Friedrich Schiller University Jena, 07745 Jena, Germany; Group of Displays and Photonics Applications, Carlos III University of Madrid, Avda. de la Universidad, 30, Leganés, 28911 Madrid, Spain 
First page
3028
Publication year
2023
Publication date
2023
Publisher
MDPI AG
e-ISSN
20794991
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
2899410222
Copyright
© 2023 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.