Molecularly-induced hypersonic optoacoustic damplification in multilayered stacks of nanoscopic inorganic/organic interfaces

Molecularly-induced hypersonic optoacoustic damplification in multilayered stacks of nanoscopic inorganic/organic interfaces | 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 Molecularly-induced hypersonic optoacoustic damplification in multilayered stacks of nanoscopic inorganic/organic interfaces Ganpati Ramanath This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-7529466/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 Molecular nanolayers (MNLs) can multiplicatively impact inorganic interface 1 strength 2,3 /toughness 4 and thermal 5 /electrical 6 transport, and multilayering inorganic/MNL interfaces yield tunable and/or unusual electrical/thermal/magnetic/optical/mechanical 7-11 properties. Recent works have envisioned superposition of interfacial MNL effects yielding emergent phenomena such as viscoelastic bandgaps 1,12 . Here, we show optoacoustic damping and amplification in adjacent sub-THz bands (termed as damplification) in titania/organodiphosphonate-MNL multilayers, providing experimental evidence for viscoelastic bandgaps. MNL-induced optoacoustic damplification is entirely contrary to monotonic damping anticipated at organic MNL interfaces. Damplification frequencies are sensitive to the number of MNL interfaces and the MNL elastic properties, and hence, are tunable by manipulating MNL structure and chemistry. Time-domain Brillouin spectroscopy and optical reflectance measurements indicate that damplification arises from the interference of acoustic wave trains reflected from MNL interfaces and MNL-induced optical property changes. These findings are of interest for realizing new classes of hypersonic viscoelastic and optoacoustic rectifiers, filters, switches and transducers through molecular engineering of inorganic interfaces. Full Text Additional Declarations The authors declare no competing interests. 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-7529466","acceptedTermsAndConditions":true,"allowDirectSubmit":true,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":509840935,"identity":"ab34bd60-5c9c-4ae0-b47a-6dfd617692c0","order_by":0,"name":"Ganpati Ramanath","email":"data:image/png;base64,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","orcid":"https://orcid.org/0000-0002-8718-9760","institution":"","correspondingAuthor":true,"prefix":"","firstName":"Ganpati","middleName":"","lastName":"Ramanath","suffix":""}],"badges":[],"createdAt":"2025-09-03 17:44:43","currentVersionCode":1,"declarations":{"humanSubjects":false,"vertebrateSubjects":false,"conflictsOfInterestStatement":false,"humanSubjectEthicalGuidelines":false,"humanSubjectConsent":false,"humanSubjectClinicalTrial":false,"humanSubjectCaseReport":false,"vertebrateSubjectEthicalGuidelines":false},"doi":"10.21203/rs.3.rs-7529466/v1","doiUrl":"https://doi.org/10.21203/rs.3.rs-7529466/v1","draftVersion":[],"editorialEvents":[],"editorialNote":"","failedWorkflow":false,"files":[{"id":90574231,"identity":"5f0ea746-c585-48c4-95a3-93dd23020d06","added_by":"auto","created_at":"2025-09-04 08:59:44","extension":"pdf","order_by":1,"title":"","display":"","copyAsset":false,"role":"manuscript-pdf","size":2444157,"visible":true,"origin":"","legend":"","description":"","filename":"6HypersonicOptoacousticDamplificationNature28Aug2025a.pdf","url":"https://assets-eu.researchsquare.com/files/rs-7529466/v1_covered_42fef449-f132-478a-8cb6-9ffa121bfbd8.pdf"}],"financialInterests":"The authors declare no competing interests.","formattedTitle":"\u003cp\u003e\u003cem\u003eMolecularly-induced hypersonic optoacoustic damplification in multilayered stacks of nanoscopic inorganic/organic interfaces\u003c/em\u003e\u003c/p\u003e","fulltext":[],"fulltextSource":"","fullText":"","funders":[],"hasAdminPriorityOnWorkflow":false,"hasManuscriptDocX":false,"hasOptedInToPreprint":true,"hasPassedJournalQc":"","hasAnyPriority":true,"hideJournal":true,"highlight":"","institution":"Rensselaer Polytechnic Institute","isAcceptedByJournal":false,"isAuthorSuppliedPdf":true,"isDeskRejected":"","isHiddenFromSearch":false,"isInQc":false,"isInWorkflow":true,"isPdf":true,"isPdfUpToDate":true,"isWithdrawnOrRetracted":false,"journal":{"display":true,"email":"[email protected]","identity":"researchsquare","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":true,"externalIdentity":"","sideBox":"","snPcode":"","submissionUrl":"/submission","title":"Research Square","twitterHandle":"researchsquare","acdcEnabled":true,"dfaEnabled":false,"editorialSystem":"","reportingPortfolio":"","inReviewEnabled":false,"inReviewRevisionsEnabled":true},"keywords":"","lastPublishedDoi":"10.21203/rs.3.rs-7529466/v1","lastPublishedDoiUrl":"https://doi.org/10.21203/rs.3.rs-7529466/v1","license":{"name":"CC BY 4.0","url":"https://creativecommons.org/licenses/by/4.0/"},"manuscriptAbstract":"\u003cp\u003e\u003cstrong\u003eMolecular nanolayers (MNLs) can multiplicatively impact inorganic interface\u003c/strong\u003e\u003csup\u003e1\u003c/sup\u003e\u003cstrong\u003e strength\u003c/strong\u003e\u003csup\u003e\u003cstrong\u003e2,3\u003c/strong\u003e\u003c/sup\u003e\u003cstrong\u003e/toughness\u003c/strong\u003e\u003csup\u003e\u003cstrong\u003e4\u003c/strong\u003e\u003c/sup\u003e\u003cstrong\u003e and thermal\u003c/strong\u003e\u003csup\u003e\u003cstrong\u003e5\u003c/strong\u003e\u003c/sup\u003e\u003cstrong\u003e/electrical\u003c/strong\u003e\u003csup\u003e6\u003c/sup\u003e\u003cstrong\u003e transport, and multilayering inorganic/MNL interfaces yield tunable and/or unusual electrical/thermal/magnetic/optical/mechanical\u003c/strong\u003e\u003csup\u003e\u003cstrong\u003e7-11\u003c/strong\u003e\u003c/sup\u003e\u003cstrong\u003e properties. Recent works have envisioned superposition of interfacial MNL effects yielding emergent phenomena such as viscoelastic bandgaps\u003c/strong\u003e\u003csup\u003e1,12\u003c/sup\u003e\u003cstrong\u003e. Here, we show optoacoustic damping and amplification in adjacent sub-THz bands (termed as damplification) in titania/organodiphosphonate-MNL multilayers, providing experimental evidence for viscoelastic bandgaps. MNL-induced optoacoustic damplification is entirely contrary to monotonic damping anticipated at organic MNL interfaces. Damplification frequencies are sensitive to the number of MNL interfaces and the MNL elastic properties, and hence, are tunable by manipulating MNL structure and chemistry. Time-domain Brillouin spectroscopy and optical reflectance measurements indicate that damplification arises from the interference of acoustic wave trains reflected from MNL interfaces and MNL-induced optical property changes. 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