{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,11,4]],"date-time":"2025-11-04T11:05:07Z","timestamp":1762254307465,"version":"build-2065373602"},"reference-count":32,"publisher":"MDPI AG","issue":"21","license":[{"start":{"date-parts":[[2022,10,26]],"date-time":"2022-10-26T00:00:00Z","timestamp":1666742400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"National Natural Science Foundation of China","award":["61875250","61975189","LD21F050001","Y21F040001","RA2101","2021C03019","201903D421032","01804D131038","xky2022032"],"award-info":[{"award-number":["61875250","61975189","LD21F050001","Y21F040001","RA2101","2021C03019","201903D421032","01804D131038","xky2022032"]}]},{"name":"Zhejiang Provincial Natural Science Foundation of China","award":["61875250","61975189","LD21F050001","Y21F040001","RA2101","2021C03019","201903D421032","01804D131038","xky2022032"],"award-info":[{"award-number":["61875250","61975189","LD21F050001","Y21F040001","RA2101","2021C03019","201903D421032","01804D131038","xky2022032"]}]},{"name":"Key Research Project by Department of Water Resources of Zhejiang Province","award":["61875250","61975189","LD21F050001","Y21F040001","RA2101","2021C03019","201903D421032","01804D131038","xky2022032"],"award-info":[{"award-number":["61875250","61975189","LD21F050001","Y21F040001","RA2101","2021C03019","201903D421032","01804D131038","xky2022032"]}]},{"name":"Key Research and Development Project of Zhejiang Province","award":["61875250","61975189","LD21F050001","Y21F040001","RA2101","2021C03019","201903D421032","01804D131038","xky2022032"],"award-info":[{"award-number":["61875250","61975189","LD21F050001","Y21F040001","RA2101","2021C03019","201903D421032","01804D131038","xky2022032"]}]},{"name":"Key R&amp;D Projects of Shanxi Province","award":["61875250","61975189","LD21F050001","Y21F040001","RA2101","2021C03019","201903D421032","01804D131038","xky2022032"],"award-info":[{"award-number":["61875250","61975189","LD21F050001","Y21F040001","RA2101","2021C03019","201903D421032","01804D131038","xky2022032"]}]},{"name":"Scientific Research Foundation at Zhejiang University of Water Resources and Electric Power","award":["61875250","61975189","LD21F050001","Y21F040001","RA2101","2021C03019","201903D421032","01804D131038","xky2022032"],"award-info":[{"award-number":["61875250","61975189","LD21F050001","Y21F040001","RA2101","2021C03019","201903D421032","01804D131038","xky2022032"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>A novel nano-refractive index sensor based on the Fano resonance phenomenon is proposed in this paper. The sensor consists of the metal-insulator-metal (MIM) waveguide and a V-ring cavity with a groove (VRCG). We analyzed the performance of the nanoscale sensor using the finite element method. The simulation results show that the asymmetry of the geometric structure itself is the main factor leading to Fano resonance splitting. In Fano splitting mode, the Fano bandwidth of the system can be significantly reduced when the sensor sensitivity is slightly reduced, so that the figure of merit (FOM) of the sensor can be substantially improved. Based on the above advantages, the sensor\u2019s sensitivity in this paper is as high as 2765 nm\/RIU, FOM = 50.28. In addition, we further applied the sensor to alcohol concentration detection. The effect is good, and the sensitivity achieves about 150. This type of sensor has a bright future in the precision measurement of solution concentrations.<\/jats:p>","DOI":"10.3390\/s22218197","type":"journal-article","created":{"date-parts":[[2022,10,26]],"date-time":"2022-10-26T07:17:48Z","timestamp":1666768668000},"page":"8197","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Refractive Index and Alcohol-Concentration Sensor Based on Fano Phenomenon"],"prefix":"10.3390","volume":"22","author":[{"given":"Qiang","family":"Wang","sequence":"first","affiliation":[{"name":"School of Electrical and Control Engineering, North University of China, Taiyuan 030051, China"},{"name":"School of Electrical Engineering, Zhejiang University of Water Resources and Electric Power, Hangzhou 310018, China"},{"name":"Joint Laboratory of Intelligent Equipment and System for Water Conservancy and Hydropower Safety Monitoring of Zhejiang Province and Belarus, Hangzhou 310018, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7588-3616","authenticated-orcid":false,"given":"Shubin","family":"Yan","sequence":"additional","affiliation":[{"name":"School of Electrical Engineering, Zhejiang University of Water Resources and Electric Power, Hangzhou 310018, China"},{"name":"Joint Laboratory of Intelligent Equipment and System for Water Conservancy and Hydropower Safety Monitoring of Zhejiang Province and Belarus, Hangzhou 310018, China"}]},{"given":"Jilai","family":"Liu","sequence":"additional","affiliation":[{"name":"School of Electrical Engineering, Zhejiang University of Water Resources and Electric Power, Hangzhou 310018, China"}]},{"given":"Xiaoyu","family":"Zhang","sequence":"additional","affiliation":[{"name":"School of Electrical and Control Engineering, North University of China, Taiyuan 030051, China"},{"name":"School of Electrical Engineering, Zhejiang University of Water Resources and Electric Power, Hangzhou 310018, China"},{"name":"Joint Laboratory of Intelligent Equipment and System for Water Conservancy and Hydropower Safety Monitoring of Zhejiang Province and Belarus, Hangzhou 310018, China"}]},{"given":"Lifang","family":"Shen","sequence":"additional","affiliation":[{"name":"School of Electrical Engineering, Zhejiang University of Water Resources and Electric Power, Hangzhou 310018, China"}]},{"given":"Pengwei","family":"Liu","sequence":"additional","affiliation":[{"name":"School of Electrical and Control Engineering, North University of China, Taiyuan 030051, China"},{"name":"School of Electrical Engineering, Zhejiang University of Water Resources and Electric Power, Hangzhou 310018, China"},{"name":"Joint Laboratory of Intelligent Equipment and System for Water Conservancy and Hydropower Safety Monitoring of Zhejiang Province and Belarus, Hangzhou 310018, China"}]},{"given":"Yang","family":"Cui","sequence":"additional","affiliation":[{"name":"School of Electrical Engineering, Zhejiang University of Water Resources and Electric Power, Hangzhou 310018, China"}]},{"given":"Tingsong","family":"Li","sequence":"additional","affiliation":[{"name":"School of Electrical and Control Engineering, North University of China, Taiyuan 030051, China"},{"name":"School of Electrical Engineering, Zhejiang University of Water Resources and Electric Power, Hangzhou 310018, China"},{"name":"Joint Laboratory of Intelligent Equipment and System for Water Conservancy and Hydropower Safety Monitoring of Zhejiang Province and Belarus, Hangzhou 310018, China"}]},{"given":"Yifeng","family":"Ren","sequence":"additional","affiliation":[{"name":"School of Electrical and Control Engineering, North University of China, Taiyuan 030051, China"}]}],"member":"1968","published-online":{"date-parts":[[2022,10,26]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"16139","DOI":"10.1364\/OE.19.016139","article-title":"The electromagnetics of light transmission through subwavelength slits in metallic films","volume":"19","author":"Weiner","year":"2011","journal-title":"Opt. Express"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"824","DOI":"10.1038\/nature01937","article-title":"Surface plasmon subwavelength optics","volume":"424","author":"Barnes","year":"2003","journal-title":"Nature"},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"490","DOI":"10.1038\/nbt.2886","article-title":"Labelfree detection and molecular profiling of exosomes with a nano-plasmonic sensor","volume":"32","author":"Im","year":"2014","journal-title":"Nat. Biotechnol."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"139","DOI":"10.1016\/j.ijleo.2018.06.027","article-title":"Tunable Fano resonance in plasmonic MDM waveguide with a square type split-ring resonator","volume":"171","author":"Yi","year":"2018","journal-title":"Optik"},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"189","DOI":"10.1126\/science.1114849","article-title":"Plasmonics: Merging photonics and electronics at nanoscale dimensions","volume":"311","author":"Ozbay","year":"2006","journal-title":"Science"},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"8314","DOI":"10.1021\/ja300655f","article-title":"NH2-MIL-53(Al): A high-contrast reversible solid-state nonlinear optical switch","volume":"134","author":"Veen","year":"2012","journal-title":"J. Am. Chem. Soc."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"543","DOI":"10.1038\/nphoton.2017.142","article-title":"Fano resonance in photonics","volume":"11","author":"Limonov","year":"2017","journal-title":"Nat. Photonics"},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"7633","DOI":"10.1364\/OE.19.007633","article-title":"Plasmonic filters and optical directional couplers based on wide metal-insulator-metal structure","volume":"19","author":"Chen","year":"2011","journal-title":"Opt. Express"},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"307","DOI":"10.1007\/s11468-015-0035-y","article-title":"Side-Coupled Cavity-Induced Fano Resonance and Its Application in Nanosensor","volume":"11","author":"Chen","year":"2015","journal-title":"Plasmonics"},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"3408","DOI":"10.1364\/OE.20.003408","article-title":"Plasmon filters and resonators in metal-insulator-metal waveguides","volume":"20","author":"Neutens","year":"2012","journal-title":"Opt. Express"},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"1291","DOI":"10.1007\/s11468-015-0174-1","article-title":"A MIM Filter Based on a Side-Coupled Crossbeam Square-Ring Resonator","volume":"11","author":"Wang","year":"2016","journal-title":"Plasmonics"},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"092401","DOI":"10.3788\/COL202018.092401","article-title":"Plasmonic Luneburg lens and plasmonic nano coupler","volume":"18","author":"Zhang","year":"2020","journal-title":"Chin. Opt. Lett."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"4977","DOI":"10.1021\/nl302610v","article-title":"A plasmonic Fano switch","volume":"12","author":"Chang","year":"2012","journal-title":"Nano Lett."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"4878","DOI":"10.1364\/AO.58.004878","article-title":"Refractive index sensor based on multiple Fano resonances in a plasmonic MIM structure","volume":"58","author":"Li","year":"2019","journal-title":"Appl. Opt."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"166237","DOI":"10.1016\/j.ijleo.2020.166237","article-title":"Sensor based on multiple Fano resonances in MIM waveguide resonator system with silver nanorod-defect","volume":"229","author":"Hu","year":"2021","journal-title":"Optik"},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"1230","DOI":"10.1039\/C3CS60187K","article-title":"Molecular plasmonics for nanoscale spectroscopy","volume":"43","author":"Sonntag","year":"2014","journal-title":"Chem. Soc. Rev."},{"key":"ref_17","doi-asserted-by":"crossref","unstructured":"Xie, Y., Huang, Y., Xu, W., Zhao, W., and He, C. (2016). A Plasmonic Temperature-Sensing Structure Based on Dual Laterally Side-Coupled Hexagonal Cavities. Sensors, 16.","DOI":"10.3390\/s16050706"},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"055002","DOI":"10.1088\/2040-8978\/18\/5\/055002","article-title":"Fano resonances in a plasmonic waveguide system composed of stub coupled with a square cavity resonator","volume":"18","author":"Yun","year":"2016","journal-title":"J. Opt."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"6450","DOI":"10.1364\/OE.19.006450","article-title":"Energy transport in metal nanoparticle chains via sub-radiant plasmon modes","volume":"19","author":"Willingham","year":"2011","journal-title":"Opt. Express"},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"4372","DOI":"10.1109\/JSEN.2018.2826040","article-title":"Plasmonics-Based Refractive Index Sensor for Detection of Hemoglobin Concentration","volume":"18","author":"Zafar","year":"2018","journal-title":"IEEE Sens. J."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"2173","DOI":"10.1007\/s11664-019-07902-3","article-title":"Design of an Optical Switch and Sensor Based on a MIM Coupled Waveguide Using a DNA Composite","volume":"49","author":"Maryam","year":"2020","journal-title":"J. Electron. Mater."},{"key":"ref_22","doi-asserted-by":"crossref","unstructured":"Yang, X., Hua, E., Su, H., Guo, J., and Yan, S. (2020). A Nanostructure with Defect Based on Fano Resonance for Application on Refractive-Index and Temperature Sensing. Sensors, 20.","DOI":"10.3390\/s20154125"},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"256","DOI":"10.3389\/fphy.2020.00256","article-title":"Double Fano Resonances in S-Shaped Plasmonic Metasurfaces in Terahertz Region","volume":"8","author":"Xu","year":"2020","journal-title":"Front. Phys."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"4601110","DOI":"10.1109\/JPHOT.2019.2920433","article-title":"Analogue of Electromagnetically Induced Transparency in an S-Shaped All-Dielectric Metasurface","volume":"11","author":"Diao","year":"2019","journal-title":"IEEE Photonics J."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"20","DOI":"10.1016\/S1369-7021(06)71572-3","article-title":"Plasmonics: The next chip-scale technology","volume":"9","author":"Zia","year":"2006","journal-title":"Mater. Today"},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"19978","DOI":"10.1364\/OE.395696","article-title":"MIM waveguide structure consisting of a semicircular resonant cavity coupled with a key-shaped resonant cavity","volume":"28","author":"Zhu","year":"2020","journal-title":"Opt. Express"},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"398","DOI":"10.1007\/BF01391532","article-title":"Excitation of nonradiative surface plasma waves in silver by the method of frustrated total reflection","volume":"216","author":"Otto","year":"1968","journal-title":"Z. Phys."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"4778","DOI":"10.1016\/j.optcom.2011.05.069","article-title":"Frequency selective metal-insulator-metal splitters for surface plasmons","volume":"284","author":"Hwang","year":"2011","journal-title":"Opt. Commun."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"2229","DOI":"10.1364\/AO.46.002229","article-title":"Modified Debye model parameters of metals applicable for broadband calculations","volume":"46","author":"Gai","year":"2007","journal-title":"Appl. Opt."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"24112","DOI":"10.1364\/OE.17.024112","article-title":"Solving dielectric and plasmonic waveguide dispersion relations on a pocket calculator","volume":"17","author":"Kekatpure","year":"2009","journal-title":"Opt. Express"},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"6312","DOI":"10.1364\/OE.19.006312","article-title":"Sharp Fano resonances in THz metamaterials","volume":"19","author":"Singh","year":"2011","journal-title":"Opt. Express"},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"2257","DOI":"10.1103\/RevModPhys.82.2257","article-title":"Fano resonances in nanoscale structures","volume":"82","author":"Miroshnichenko","year":"2010","journal-title":"Rev. Mod. Phys."}],"container-title":["Sensors"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1424-8220\/22\/21\/8197\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T01:03:03Z","timestamp":1760144583000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1424-8220\/22\/21\/8197"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2022,10,26]]},"references-count":32,"journal-issue":{"issue":"21","published-online":{"date-parts":[[2022,11]]}},"alternative-id":["s22218197"],"URL":"https:\/\/doi.org\/10.3390\/s22218197","relation":{},"ISSN":["1424-8220"],"issn-type":[{"type":"electronic","value":"1424-8220"}],"subject":[],"published":{"date-parts":[[2022,10,26]]}}}