{"title":"All-Metal Ridge-Loaded Nanocavity Array for Ratiometric Refractive-Index Sensing","authors":"Rabi Prakash Maheswari, Bamadev Das, Sujit Kumar Sahoo, Amit Rai, Pitamber Mahanandia","doi":"10.1007/s11468-026-03465-2","DOIUrl":null,"url":null,"abstract":"<div><p>We propose a Ridge-loaded Nanocavity Array (RLNA) for ratiometric refractive-index sensing. A metallic nanoridge embedded within each nanoslit modifies the transmission spectrum to produce two distinct resonances exhibiting anti-correlated intensity modulation in response to changes in the analyte refractive-index, thereby enabling dual-peak intensity-ratio interrogation. Finite element method simulations show an average ratiometric sensitivity of <span>\\(350~\\textrm{RIU}^{-1}\\)</span> over the simulated range of <span>\\(n=1.30\\)</span>–1.36. The proposed all-metal architecture realizes dual-peak operation without requiring additional functional materials or complex multilayer structures. The transmission-mode intensity-ratio readout provides a self-referenced sensing metric that suppresses common-mode intensity fluctuations, providing a potentially scalable all-metal platform suitable for plasmonic refractive-index sensing.</p></div>","PeriodicalId":736,"journal":{"name":"Plasmonics","volume":"21 10","pages":"3969 - 3978"},"PeriodicalIF":5.6000,"publicationDate":"2026-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Plasmonics","FirstCategoryId":"101","ListUrlMain":"https://link.springer.com/article/10.1007/s11468-026-03465-2","RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
引用次数: 0
Abstract
We propose a Ridge-loaded Nanocavity Array (RLNA) for ratiometric refractive-index sensing. A metallic nanoridge embedded within each nanoslit modifies the transmission spectrum to produce two distinct resonances exhibiting anti-correlated intensity modulation in response to changes in the analyte refractive-index, thereby enabling dual-peak intensity-ratio interrogation. Finite element method simulations show an average ratiometric sensitivity of \(350~\textrm{RIU}^{-1}\) over the simulated range of \(n=1.30\)–1.36. The proposed all-metal architecture realizes dual-peak operation without requiring additional functional materials or complex multilayer structures. The transmission-mode intensity-ratio readout provides a self-referenced sensing metric that suppresses common-mode intensity fluctuations, providing a potentially scalable all-metal platform suitable for plasmonic refractive-index sensing.
期刊介绍：
Plasmonics is an international forum for the publication of peer-reviewed leading-edge original articles that both advance and report our knowledge base and practice of the interactions of free-metal electrons, Plasmons.
Topics covered include notable advances in the theory, Physics, and applications of surface plasmons in metals, to the rapidly emerging areas of nanotechnology, biophotonics, sensing, biochemistry and medicine. Topics, including the theory, synthesis and optical properties of noble metal nanostructures, patterned surfaces or materials, continuous or grated surfaces, devices, or wires for their multifarious applications are particularly welcome. Typical applications might include but are not limited to, surface enhanced spectroscopic properties, such as Raman scattering or fluorescence, as well developments in techniques such as surface plasmon resonance and near-field scanning optical microscopy.
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