{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,15]],"date-time":"2026-01-15T03:38:52Z","timestamp":1768448332773,"version":"3.49.0"},"reference-count":39,"publisher":"MDPI AG","issue":"5","license":[{"start":{"date-parts":[[2016,5,5]],"date-time":"2016-05-05T00:00:00Z","timestamp":1462406400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>A refractive index sensor based on metal-insulator-metal (MIM) waveguides coupled double rectangular cavities is proposed and investigated numerically using the finite element method (FEM). The transmission properties and refractive index sensitivity of various configurations of the sensor are systematically investigated. An asymmetric Fano resonance lineshape is observed in the transmission spectra of the sensor, which is induced by the interference between a broad resonance mode in one rectangular and a narrow one in the other. The effect of various structural parameters on the Fano resonance and the refractive index sensitivity of the system based on Fano resonance is investigated. The proposed plasmonic refractive index sensor shows a maximum sensitivity of 596 nm\/RIU.<\/jats:p>","DOI":"10.3390\/s16050642","type":"journal-article","created":{"date-parts":[[2016,5,6]],"date-time":"2016-05-06T10:19:23Z","timestamp":1462529963000},"page":"642","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":143,"title":["Fano Resonance Based on Metal-Insulator-Metal Waveguide-Coupled Double Rectangular Cavities for Plasmonic Nanosensors"],"prefix":"10.3390","volume":"16","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6464-4003","authenticated-orcid":false,"given":"Zhidong","family":"Zhang","sequence":"first","affiliation":[{"name":"Science and Technology on Electronic Test &amp; Measurement Laboratory, North University of China, No. 3 Xueyuan Road, Taiyuan 030051, China"},{"name":"Key Laboratory of Instrumentation Science &amp; Dynamic Measurement, Ministry of Eduction, North University of China, No. 3 Xueyuan Road, Taiyuan 030051, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Liang","family":"Luo","sequence":"additional","affiliation":[{"name":"Science and Technology on Electronic Test &amp; Measurement Laboratory, North University of China, No. 3 Xueyuan Road, Taiyuan 030051, China"},{"name":"Key Laboratory of Instrumentation Science &amp; Dynamic Measurement, Ministry of Eduction, North University of China, No. 3 Xueyuan Road, Taiyuan 030051, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Chenyang","family":"Xue","sequence":"additional","affiliation":[{"name":"Science and Technology on Electronic Test &amp; Measurement Laboratory, North University of China, No. 3 Xueyuan Road, Taiyuan 030051, China"},{"name":"Key Laboratory of Instrumentation Science &amp; Dynamic Measurement, Ministry of Eduction, North University of China, No. 3 Xueyuan Road, Taiyuan 030051, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1762-9246","authenticated-orcid":false,"given":"Wendong","family":"Zhang","sequence":"additional","affiliation":[{"name":"Science and Technology on Electronic Test &amp; Measurement Laboratory, North University of China, No. 3 Xueyuan Road, Taiyuan 030051, China"},{"name":"Key Laboratory of Instrumentation Science &amp; Dynamic Measurement, Ministry of Eduction, North University of China, No. 3 Xueyuan Road, Taiyuan 030051, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shubin","family":"Yan","sequence":"additional","affiliation":[{"name":"Science and Technology on Electronic Test &amp; Measurement Laboratory, North University of China, No. 3 Xueyuan Road, Taiyuan 030051, China"},{"name":"Key Laboratory of Instrumentation Science &amp; Dynamic Measurement, Ministry of Eduction, North University of China, No. 3 Xueyuan Road, Taiyuan 030051, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2016,5,5]]},"reference":[{"key":"ref_1","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_2","doi-asserted-by":"crossref","first-page":"131","DOI":"10.1016\/j.physrep.2004.11.001","article-title":"Nano-optics of surface plasmon polaritons","volume":"408","author":"Zayats","year":"2005","journal-title":"Phys. Rep."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"25","DOI":"10.1016\/j.nanoen.2011.09.002","article-title":"Plasmonic nano-lasers","volume":"1","author":"Yin","year":"2012","journal-title":"Nano Energy"},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"7200306","DOI":"10.1109\/JQE.2015.2472979","article-title":"Achievement of large normalized delay bandwidth product by exciting electromagnetic-induced transparency in plasmonic waveguide","volume":"51","author":"Zafar","year":"2015","journal-title":"IEEE J. Quantum Electron."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"797","DOI":"10.1007\/s11468-012-9475-9","article-title":"Fano resonance in a gear-shaped nanocavity of the metal-insulator-metal waveguide","volume":"8","author":"Zhang","year":"2012","journal-title":"Plasmonics"},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"053602","DOI":"10.1103\/PhysRevLett.103.053602","article-title":"Vacuum Rabi splitting and strong-coupling dynamics for surface-plasmon polaritons and rhodamine 6G molecules","volume":"103","author":"Hakala","year":"2009","journal-title":"Phys. Rev. Lett."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"19376","DOI":"10.1021\/acs.jpcc.5b05690","article-title":"Metal nanoparticle-nanowire assisted SERS on film","volume":"119","author":"Hao","year":"2015","journal-title":"J. Phys. Chem. C"},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1016\/j.optcom.2014.11.064","article-title":"A nanometeric temperature sensor based on plasmonic waveguide with an ethanol-sealed rectangular cavity","volume":"339","author":"Wu","year":"2015","journal-title":"Opt. Commun."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"15914","DOI":"10.3390\/s140915914","article-title":"Development of phase detection schemes based on surface plasmon resonance using interferometry","volume":"14","author":"Kashif","year":"2014","journal-title":"Sensors"},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"709","DOI":"10.1038\/nphoton.2012.266","article-title":"Plasmonics for future biosensors","volume":"6","author":"Brolo","year":"2012","journal-title":"Nat. Photonics"},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"12636","DOI":"10.1021\/jp203530e","article-title":"Surface plasmon enhanced fluorescence of dye molecules on metal grating films","volume":"115","author":"Jiang","year":"2011","journal-title":"J. Phys. Chem. C"},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"e294","DOI":"10.1038\/lsa.2015.67","article-title":"Nanoplasmonic waveguides: Towards applications in integrated nanophotonic circuits","volume":"4","author":"Fang","year":"2015","journal-title":"Light Sci. Appl."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1109\/JPHOT.2014.2374612","article-title":"Multiple fano resonances based on different waveguide modes in a symmetry breaking plasmonic system","volume":"6","author":"Chen","year":"2014","journal-title":"IEEE Photonics J."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"7959","DOI":"10.3390\/s140507959","article-title":"Recent advances in plasmonic sensors","volume":"14","author":"Tong","year":"2014","journal-title":"Sensors"},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"773","DOI":"10.1007\/s11468-011-9263-y","article-title":"Numerical investigation of a branch-shaped filter based on metal-insulator-metal waveguide","volume":"6","author":"Zhang","year":"2011","journal-title":"Plasmonics"},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"4844","DOI":"10.1109\/JLT.2014.2359938","article-title":"High transmission efficiency wavelength division multiplexer based on metal-insulator-metal plasmonic waveguides","volume":"32","author":"Wu","year":"2014","journal-title":"J. Lightwave Technol."},{"key":"ref_17","first-page":"1","article-title":"Novel Plasmonic sensor based on metal-insulator-metal waveguide with side-coupled hexagonal cavity","volume":"7","author":"Xie","year":"2015","journal-title":"IEEE Photonics J."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"14688","DOI":"10.1364\/OE.22.014688","article-title":"Independently tunable double Fano resonances in asymmetric MIM waveguide structure","volume":"22","author":"Qi","year":"2014","journal-title":"Opt. Express"},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"08547","DOI":"10.1038\/srep08547","article-title":"Ultrasensitive biosensors using enhanced Fano resonances in capped gold nanoslit arrays","volume":"5","author":"Lee","year":"2015","journal-title":"Sci. Rep."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"52","DOI":"10.1364\/OL.39.000052","article-title":"Fano resonances in a single defect nanocavity coupled with a plasmonic waveguide","volume":"39","author":"Chen","year":"2014","journal-title":"Opt. Lett."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"1627","DOI":"10.1007\/s11468-013-9580-4","article-title":"Coupled-resonator-induced Fano resonances for plasmonic sensing with ultra-high figure of merits","volume":"8","author":"Chen","year":"2013","journal-title":"Plasmonics"},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"707","DOI":"10.1038\/nmat2810","article-title":"The Fano resonance in plasmonic nanostructures and metamaterials","volume":"9","author":"Zheludev","year":"2010","journal-title":"Nat. Mater."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"329","DOI":"10.1002\/lpor.201200021","article-title":"Fano resonance in novel plasmonic nanostructures","volume":"7","author":"Rahmani","year":"2013","journal-title":"Laser Photonics Rev."},{"key":"ref_24","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."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"7669","DOI":"10.1364\/OE.22.007669","article-title":"The sensing characteristics of plasmonic waveguide with a ring resonator","volume":"22","author":"Wu","year":"2014","journal-title":"Opt. Express"},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"29183","DOI":"10.3390\/s151129183","article-title":"A refractive index sensor based on a metal-insulator-metal waveguide-coupled ring resonator","volume":"15","author":"Yan","year":"2015","journal-title":"Sensors"},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"093099-1","DOI":"10.1117\/1.JNP.9.093099","article-title":"Theoretical investigation of a plasmonic sensor based on a metal-insulator-metal waveguide with a side-coupled nanodisk resonator","volume":"9","author":"Xie","year":"2015","journal-title":"J. Nanophotonics"},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"721","DOI":"10.1007\/s11468-014-9858-1","article-title":"Spectral splitting based on electromagnetically induced transparency in plasmonic waveguide resonator system","volume":"10","author":"Chen","year":"2014","journal-title":"Plasmonics"},{"key":"ref_29","first-page":"4801408-1","article-title":"Tunable electromagnetically induced transparency in plasmonic system and its application in nanosensor and spectral splitting","volume":"7","author":"Chen","year":"2015","journal-title":"IEEE Photonics J."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"1657","DOI":"10.1021\/nl200135r","article-title":"Substrate-induced Fano resonances of a plasmonic nanocube: A route to increased-sensitivity localized surface plasmon resonance sensors revealed","volume":"11","author":"Zhang","year":"2011","journal-title":"Nano Lett."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"325303","DOI":"10.1088\/0022-3727\/48\/32\/325303","article-title":"Waveguide-coupled surface plasmon resonance sensor structures: Fano lineshape engineering for ultrahigh-resolution sensing","volume":"48","author":"Hayashi","year":"2015","journal-title":"J. Phys. D Appl. Phys."},{"key":"ref_32","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_33","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_34","doi-asserted-by":"crossref","first-page":"1371","DOI":"10.1109\/TNANO.2011.2147330","article-title":"A simple nanometeric plasmonic narrow-band filter structure based on metal-insulator-metal waveguide","volume":"10","author":"Zhu","year":"2011","journal-title":"IEEE Trans. Nanotechnol."},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"1500","DOI":"10.1364\/OL.36.001500","article-title":"Wavelength demultiplexing structure based on arrayed plasmonic slot cavities","volume":"36","author":"Hu","year":"2011","journal-title":"Opt. Lett."},{"key":"ref_36","unstructured":"Haus, H.A. (1984). Waves and Fields in Optoelectronics, Prentice-Hall."},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"1505","DOI":"10.1109\/5.104225","article-title":"Coupled-mode theory","volume":"79","author":"Haus","year":"1991","journal-title":"IEEE Proc."},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"10907","DOI":"10.1364\/OE.19.010907","article-title":"Fano-type spectral asymmetry and its control for plasmonic metal-insulator-metal stub structures","volume":"19","author":"Piao","year":"2011","journal-title":"Opt. Express"},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"1565","DOI":"10.3390\/s110201565","article-title":"Overview of the characteristics of micro- and nano-structured surface plasmon resonance sensors","volume":"11","author":"Roh","year":"2011","journal-title":"Sensors"}],"container-title":["Sensors"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1424-8220\/16\/5\/642\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T19:23:19Z","timestamp":1760210599000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1424-8220\/16\/5\/642"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2016,5,5]]},"references-count":39,"journal-issue":{"issue":"5","published-online":{"date-parts":[[2016,5]]}},"alternative-id":["s16050642"],"URL":"https:\/\/doi.org\/10.3390\/s16050642","relation":{},"ISSN":["1424-8220"],"issn-type":[{"value":"1424-8220","type":"electronic"}],"subject":[],"published":{"date-parts":[[2016,5,5]]}}}