Local Circular Dichroism Induced by Near-Field Interference in Asymmetric Plasmonic Nanocylinder Trimer

Local Circular Dichroism Induced by Near-Field Interference in Asymmetric Plasmonic Nanocylinder Trimer | 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 Research Article Local Circular Dichroism Induced by Near-Field Interference in Asymmetric Plasmonic Nanocylinder Trimer Shuyang Lan, Hancong Wang, Liang Wu, Jingyi Xie, Jianhua Wang This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-9433801/v1 This work is licensed under a CC BY 4.0 License Status: Under Review Version 1 posted 4 You are reading this latest preprint version Abstract Surface plasmons are collective oscillations of electrons that can confine light within extremely tiny nanoscale spaces, acting to enhance the spectral signals (such as Raman and circular dichroism) of molecules. Borrowed from circular dichroism in chemistry, plasmonic local circular dichroism (CD) refers to the difference in electric field enhancement excited by left-handed (LCP) and right-handed (RCP) circularly polarized light in a nanogap. Nanosphere trimers have been employed to realize local CD. However, spherical nanoparticles exhibit a small gap area and poor structural stability. In this article, we propose asymmetric nanocylinder trimers to obtain a strong local CD signal. In contrast to nanospheres, nanocylinder sidewalls increase effective gap areas, and are easy to obtain by microfabrication such as electron beam lithography. We find that the asymmetric nanocylinder trimer achieves a local CD parameter ρ = 0.94 under ~ 782 nm light excitation. This strong local CD within the gaps mainly originates from the near-field interference between different modes generated by circularly polarized light. Furthermore, the gap distance and symmetry have a significant influence on the local CD. A giant local CD can be obtained for small gaps (~ 1 nm) and right-angle trimers. These results provide a physical basis for the development of plasmonic circular dichroism, chirality, and are of interest for the field of nanosensors, nanoantennas and solar energy conversion. Surface plasmons Nanocylinder Trimer Near-field enhancement Circular dichroism (CD) Chirality Full Text Additional Declarations No competing interests reported. Cite Share Download PDF Status: Under Review Version 1 posted Reviewers invited by journal 26 Apr, 2026 Editor assigned by journal 17 Apr, 2026 Submission checks completed at journal 17 Apr, 2026 First submitted to journal 16 Apr, 2026 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. 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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-9433801","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":629957362,"identity":"4b2d1536-4afb-4c6e-bb5e-c788374588e7","order_by":0,"name":"Shuyang Lan","email":"","orcid":"","institution":"Fujian University of Technology","correspondingAuthor":false,"prefix":"","firstName":"Shuyang","middleName":"","lastName":"Lan","suffix":""},{"id":629957363,"identity":"623e7ede-ed54-4e87-a5de-76dc2e9e632b","order_by":1,"name":"Hancong Wang","email":"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAZAAAAAyAQMAAABI0h/eAAAABlBMVEX///8AAABVwtN+AAAACXBIWXMAAA7EAAAOxAGVKw4bAAAA0klEQVRIiWNgGAWjYBACAwhlw8/YAKLZiNeSJtnYwEyalsOSDQzEajFnP2P4ueDXeQnmGfkHGD6UHWbgn92AX4tlT46x9My+2xKMM5IZGGecO8wgcecAAYfd4N0gzdtzuw6khZm37TCDgUQCQS2bf/P2nAPbwvyXSC3bpHl+HIBoYSRKy5n8b9a8DckSjD2PDQ72nEvnkbhBSMvxY8m3ef7YSRi2Jz588KPMWo5/BgEtYMDYxsBg2MDAcADI5iFCPQj8YWCQJ1LpKBgFo2AUjEAAAL0IQlO0EVEOAAAAAElFTkSuQmCC","orcid":"","institution":"Fujian University of Technology","correspondingAuthor":true,"prefix":"","firstName":"Hancong","middleName":"","lastName":"Wang","suffix":""},{"id":629957364,"identity":"9addf494-ecea-4bae-958c-5303ace0c21c","order_by":2,"name":"Liang Wu","email":"","orcid":"","institution":"Fujian University of Technology","correspondingAuthor":false,"prefix":"","firstName":"Liang","middleName":"","lastName":"Wu","suffix":""},{"id":629957365,"identity":"52a26aed-4979-4c80-94b0-b5727c01d3b4","order_by":3,"name":"Jingyi Xie","email":"","orcid":"","institution":"Fujian University of Technology","correspondingAuthor":false,"prefix":"","firstName":"Jingyi","middleName":"","lastName":"Xie","suffix":""},{"id":629957366,"identity":"3e642836-2fe8-4b01-8ad6-78ba7958966d","order_by":4,"name":"Jianhua Wang","email":"","orcid":"","institution":"Fujian University of Technology","correspondingAuthor":false,"prefix":"","firstName":"Jianhua","middleName":"","lastName":"Wang","suffix":""}],"badges":[],"createdAt":"2026-04-16 06:09:55","currentVersionCode":1,"declarations":"","doi":"10.21203/rs.3.rs-9433801/v1","doiUrl":"https://doi.org/10.21203/rs.3.rs-9433801/v1","draftVersion":[],"editorialEvents":[],"editorialNote":"","failedWorkflow":false,"files":[{"id":108493880,"identity":"7bc9526b-df58-4f94-a06c-0aaf01bf7f42","added_by":"auto","created_at":"2026-05-05 10:02:00","extension":"pdf","order_by":1,"title":"","display":"","copyAsset":false,"role":"manuscript-pdf","size":647512,"visible":true,"origin":"","legend":"","description":"","filename":"LocalCircularDichroismInducedbyNearFieldInterferenceinAsymmetricPlasmonicNanocylinderTrimer.pdf","url":"https://assets-eu.researchsquare.com/files/rs-9433801/v1_covered_975018db-86ec-46f5-924b-e57f0343ebcc.pdf"}],"financialInterests":"No competing interests reported.","formattedTitle":"Local Circular Dichroism Induced by Near-Field Interference in Asymmetric Plasmonic Nanocylinder Trimer","fulltext":[],"fulltextSource":"","fullText":"","funders":[],"hasAdminPriorityOnWorkflow":false,"hasManuscriptDocX":false,"hasOptedInToPreprint":true,"hasPassedJournalQc":"","hasAnyPriority":false,"hideJournal":false,"highlight":"","institution":"","isAcceptedByJournal":false,"isAuthorSuppliedPdf":true,"isDeskRejected":"","isHiddenFromSearch":false,"isInQc":false,"isInWorkflow":false,"isPdf":true,"isPdfUpToDate":true,"isWithdrawnOrRetracted":false,"journal":{"display":true,"email":"[email protected]","identity":"plasmonics","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":false,"externalIdentity":"plas","sideBox":"Learn more about [Plasmonics](https://www.springer.com/journal/11468)","snPcode":"11468","submissionUrl":"https://submission.nature.com/new-submission/11468/3","title":"Plasmonics","twitterHandle":"","acdcEnabled":true,"dfaEnabled":true,"editorialSystem":"em","reportingPortfolio":"Springer Hybrid","inReviewEnabled":true,"inReviewRevisionsEnabled":false},"keywords":"Surface plasmons, Nanocylinder, Trimer, Near-field enhancement, Circular dichroism (CD), Chirality","lastPublishedDoi":"10.21203/rs.3.rs-9433801/v1","lastPublishedDoiUrl":"https://doi.org/10.21203/rs.3.rs-9433801/v1","license":{"name":"CC BY 4.0","url":"https://creativecommons.org/licenses/by/4.0/"},"manuscriptAbstract":"\u003cp\u003eSurface plasmons are collective oscillations of electrons that can confine light within extremely tiny nanoscale spaces, acting to enhance the spectral signals (such as Raman and circular dichroism) of molecules. Borrowed from circular dichroism in chemistry, plasmonic local circular dichroism (CD) refers to the difference in electric field enhancement excited by left-handed (LCP) and right-handed (RCP) circularly polarized light in a nanogap. Nanosphere trimers have been employed to realize local CD. However, spherical nanoparticles exhibit a small gap area and poor structural stability. In this article, we propose asymmetric nanocylinder trimers to obtain a strong local CD signal. In contrast to nanospheres, nanocylinder sidewalls increase effective gap areas, and are easy to obtain by microfabrication such as electron beam lithography. We find that the asymmetric nanocylinder trimer achieves a local CD parameter \u003cem\u003eρ\u003c/em\u003e\u0026thinsp;=\u0026thinsp;0.94 under ~\u0026thinsp;782 nm light excitation. This strong local CD within the gaps mainly originates from the near-field interference between different modes generated by circularly polarized light. Furthermore, the gap distance and symmetry have a significant influence on the local CD. A giant local CD can be obtained for small gaps (~\u0026thinsp;1 nm) and right-angle trimers. These results provide a physical basis for the development of plasmonic circular dichroism, chirality, and are of interest for the field of nanosensors, nanoantennas and solar energy conversion.\u003c/p\u003e","manuscriptTitle":"Local Circular Dichroism Induced by Near-Field Interference in Asymmetric Plasmonic Nanocylinder Trimer","msid":"","msnumber":"","nonDraftVersions":[{"code":1,"date":"2026-05-05 07:57:44","doi":"10.21203/rs.3.rs-9433801/v1","editorialEvents":[{"type":"communityComments","content":0},{"type":"reviewersInvited","content":"","date":"2026-04-27T03:19:37+00:00","index":"","fulltext":""},{"type":"editorAssigned","content":"","date":"2026-04-17T05:09:58+00:00","index":"","fulltext":""},{"type":"checksComplete","content":"","date":"2026-04-17T05:09:56+00:00","index":"","fulltext":""},{"type":"submitted","content":"Plasmonics","date":"2026-04-16T05:55:19+00:00","index":"","fulltext":""}],"status":"published","journal":{"display":true,"email":"[email protected]","identity":"plasmonics","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":false,"externalIdentity":"plas","sideBox":"Learn more about [Plasmonics](https://www.springer.com/journal/11468)","snPcode":"11468","submissionUrl":"https://submission.nature.com/new-submission/11468/3","title":"Plasmonics","twitterHandle":"","acdcEnabled":true,"dfaEnabled":true,"editorialSystem":"em","reportingPortfolio":"Springer Hybrid","inReviewEnabled":true,"inReviewRevisionsEnabled":false}}],"origin":"","ownerIdentity":"90eb6956-6d38-4c84-a55c-e7149d7f6aaf","owner":[],"postedDate":"May 5th, 2026","published":true,"recentEditorialEvents":[],"rejectedJournal":[],"revision":"","amendment":"","status":"under-review","subjectAreas":[],"tags":[],"updatedAt":"2026-05-05T07:57:44+00:00","versionOfRecord":[],"versionCreatedAt":"2026-05-05 07:57:44","video":"","vorDoi":"","vorDoiUrl":"","workflowStages":[]},"version":"v1","identity":"rs-9433801","journalConfig":"researchsquare"},"__N_SSP":true},"page":"/article/[identity]/[[...version]]","query":{"redirect":"/article/rs-9433801","identity":"rs-9433801","version":["v1"]},"buildId":"XKTyCvWXoU3ODBz1xrDgd","isFallback":false,"isExperimentalCompile":false,"dynamicIds":[84888],"gssp":true,"scriptLoader":[]}