Plasmonic Vortex Cavities Toward the Ultra-Compact Limit

Plasmonic Vortex Cavities Toward the Ultra-Compact Limit | 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 Plasmonic Vortex Cavities Toward the Ultra-Compact Limit Yonghui Tian, Da-Jie Yang, Jing-Yi Wang, Yuanjie Yang This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-8396871/v1 This work is licensed under a CC BY 4.0 License Status: Under Review Version 1 posted You are reading this latest preprint version Abstract Compact control of optical orbital angular momentum (OAM) is central to chip-scale photonic integration. Plasmonic vortex lenses have therefore emerged as a key on-chip platform for encoding and manipulating OAM through tunable topological-charge engineering. Advancing beyond plasmonic vortex lenses, here we propose plasmonic vortex cavities that progress toward the compactness limit—footprints < λ/10 with annular features ~λ/40. By developing a perturbative framework, we reveal the governing mechanism: a flattened and gap-tunable cavity plasmon dispersion that extremely compresses the surface plasmon polariton (SPP) wavelength. Besides, cavity PVs also exhibit quantized and resonance-enhanced spectral bands together with Bessel-type near field envelopes, originating from cavity SPP reflection at the rim and the ensuing standing wave formation. Full-wave simulations corroborate the framework, revealing discrete cavity resonances, clean phase singularities, and predictable hot-spot radii within deep-subwavelength footprints. The progression from lens-based vortices to cavity-based vortices provides an ultra-compact OAM platform toward the compactness limit, advancing chip-scale integration. Physical sciences/Optics and photonics/Optical physics/Nanophotonics and plasmonics Physical sciences/Nanoscience and technology/Nanoscale devices/Nanophotonics and plasmonics Plasmonic vortices plasmonic vortex cavities plasmonic vortex lenses ultra-compact PV geometric and dynamic phases Full Text Additional Declarations There is NO Competing Interest. Supplementary Files SInew.pdf Supplementary Information (SI) Cite Share Download PDF Status: Under Review 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. 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Plasmonic vortex lenses have therefore emerged as a key on-chip platform for encoding and manipulating OAM through tunable topological-charge engineering. Advancing beyond plasmonic vortex lenses, here we propose plasmonic vortex cavities that progress toward the compactness limit—footprints \u003c λ/10 with annular features ~λ/40. By developing a perturbative framework, we reveal the governing mechanism: a flattened and gap-tunable cavity plasmon dispersion that extremely compresses the surface plasmon polariton (SPP) wavelength. Besides, cavity PVs also exhibit quantized and resonance-enhanced spectral bands together with Bessel-type near field envelopes, originating from cavity SPP reflection at the rim and the ensuing standing wave formation. Full-wave simulations corroborate the framework, revealing discrete cavity resonances, clean phase singularities, and predictable hot-spot radii within deep-subwavelength footprints. 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