Ali M A Al-Husain, Ahmed Ghanim Wadday, Saif H Abdulwahid
{"title":"Compact dual-band MIM plasmonic sensor with enhanced sensitivity for biochemical sensing.","authors":"Ali M A Al-Husain, Ahmed Ghanim Wadday, Saif H Abdulwahid","doi":"10.1364/AO.570435","DOIUrl":null,"url":null,"abstract":"<p><p>This study investigates a novel dual-band plasmonic refractive index (RI) sensor, to our knowledge, based on an air-silver metal-insulator-metal waveguide configuration, incorporating a circular cavity featuring a centrally embedded elliptical notch. The sensor design was modeled using COMSOL Multiphysics (version 6.2) and optimized through a two-dimensional finite element method analysis. The proposed sensor exhibits dual-band resonance behavior in the ranges of 800-1200 nm and 1300-1900 nm. It demonstrated remarkable sensitivities ranging from 1137 to 1970<i>n</i><i>m</i>/<i>R</i><i>I</i><i>U</i><sup>-1</sup> for lead nitrate [<i>P</i><i>b</i>(<i>N</i><i>O</i><sub>3</sub>)<sub>2</sub>] detection and from 682 to 1136.4 nm/RIU for thyroxine (T4) sensing, alongside a high figure of merit (FoM) reaching 76 and a quality factor (Q.factor) of approximately 83. The structure also achieved a maximum transmission of ∼88<i>%</i> and a narrow full-width at half-maximum of 24.8 nm, underscoring its suitability for high-resolution detection.</p>","PeriodicalId":101299,"journal":{"name":"Applied optics","volume":"64 25","pages":"7344-7356"},"PeriodicalIF":0.0000,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Applied optics","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1364/AO.570435","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
This study investigates a novel dual-band plasmonic refractive index (RI) sensor, to our knowledge, based on an air-silver metal-insulator-metal waveguide configuration, incorporating a circular cavity featuring a centrally embedded elliptical notch. The sensor design was modeled using COMSOL Multiphysics (version 6.2) and optimized through a two-dimensional finite element method analysis. The proposed sensor exhibits dual-band resonance behavior in the ranges of 800-1200 nm and 1300-1900 nm. It demonstrated remarkable sensitivities ranging from 1137 to 1970nm/RIU-1 for lead nitrate [Pb(NO3)2] detection and from 682 to 1136.4 nm/RIU for thyroxine (T4) sensing, alongside a high figure of merit (FoM) reaching 76 and a quality factor (Q.factor) of approximately 83. The structure also achieved a maximum transmission of ∼88% and a narrow full-width at half-maximum of 24.8 nm, underscoring its suitability for high-resolution detection.
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