Room-temperature ultrastrong exciton-plasmon coupling in WS2 monolayer synthesized with a multi-singular metasurface

Room-temperature ultrastrong exciton-plasmon coupling in WS2 monolayer synthesized with a multi-singular metasurface | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Article Room-temperature ultrastrong exciton-plasmon coupling in WS2 monolayer synthesized with a multi-singular metasurface Tingting Wu, Chongwu Wang, Guangwei Hu, Zhixun Wang, Jiaxin Zhao, and 12 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-2724426/v1 This work is licensed under a CC BY 4.0 License Status: Posted Version 1 posted You are reading this latest preprint version Abstract Monolayer semiconductors exemplified by two-dimensional transition-metal dichalcogenides (TMDs) have promised next-generation atomically thin optoelectronics. Boosting their interactions with light is vital for practical applications, especially in the quantum regime where ultrastrong interaction is highly demanded but not yet realized. Here we report ultrastrong exciton-plasmon coupling in a tungsten disulfide (WS 2 ) monolayer loaded with a multi-singular plasmonic metasurface at room temperature. Different from seeking perfect metals or high-quality resonators, we create a unique type of cold-etched metasurface with multiple singularities. Multiple plasmonic hotspots that support tightly confined gap plasmons fit into the coherent area of WS 2 excitons and thus trigger the ultrastrong exciton-plasmon coupling with a normalized coupling strength of 0.104. As an application demonstration, we showed dispersive polariton-enhanced and tunable second-order nonlinearities in the WS 2 monolayer. Our findings reveal room-temperature extreme light-matter interactions in TMD monolayers for future applications in nonlinear optics, quantum information processing, laser physics and others. Physical sciences/Nanoscience and technology/Nanoscale devices/Nanophotonics and plasmonics Physical sciences/Nanoscience and technology/Nanoscale materials/Two-dimensional materials Physical sciences/Optics and photonics/Optical materials and structures/Metamaterials Full Text Additional Declarations There is NO Competing Interest. Supplementary Files RoomtemperatureutrastrongexcitonplasmoncouplinginWS2monolayerSI.docx Cite Share Download PDF Status: Posted Version 1 posted You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. Our growing team is made up of researchers and industry professionals working together to solve the most critical problems facing scientific publishing. Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-2724426","acceptedTermsAndConditions":true,"allowDirectSubmit":true,"archivedVersions":[],"articleType":"Article","associatedPublications":[],"authors":[{"id":187804588,"identity":"ad6f5b29-56b4-44c1-814b-338d1adeaac2","order_by":0,"name":"Tingting Wu","email":"","orcid":"","institution":"Nanyang Technological University","correspondingAuthor":false,"submittingAuthor":false,"prefix":"","firstName":"Tingting","middleName":"","lastName":"Wu","suffix":""},{"id":187804589,"identity":"03742b64-40e2-474a-9974-bb148ccdab17","order_by":1,"name":"Chongwu Wang","email":"","orcid":"","institution":"Nanyang Technological 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