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dc.contributor.authorLi, C
dc.contributor.authorTeimourpour, M H
dc.contributor.authorMcLeod, E
dc.contributor.authorSu, J
dc.date.accessioned2020-11-06T03:03:08Z
dc.date.available2020-11-06T03:03:08Z
dc.date.issued2018-05-16
dc.identifier.citationCheng Li, M. H. Teimourpour, Euan McLeod, Judith Su, "Enhanced whispering gallery mode sensors," Proc. SPIE 10629, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XIX, 106290Q (16 May 2018); https://doi.org/10.1117/12.2304556en_US
dc.identifier.issn0277-786X
dc.identifier.doi10.1117/12.2304556
dc.identifier.urihttp://hdl.handle.net/10150/648128
dc.description.abstractOptical whispering gallery mode (WGM) biochemical sensors operate by tracking changes in resonant frequency as materials enter the evanescent near-field of the resonator. To achieve the smallest limit of detection, it is desirable for WGM sensors to exhibit as large a frequency shift as possible for a material of a given size and refractive index, as well as the ability to track as small a frequency shift as possible. Previously, plasmonic nanoantennas have been coupled to WGM resonators to increase the magnitude of resonance shifts via plasmonic enhancement of the electric field, however this approach also results in increased scattering from the WGM, which degrades its quality factor, making it less sensitive to extremely small frequency shifts. This degradation is caused by the ohmic and scattering dissipation caused by metallic nanoantennas. Using simulations, we show here that the precise positioning of nanoantennas coupled to a microtoroid WGM resonator can be used to overcome this drawback and achieve ultrahigh-Q plasmonic cavity modes simultaneously with electric field enhancement. It is shown that a nanoantenna composed of two similarly coupled nanorods supports higher Q modes than a single nanorod antenna. Our results have immediate application in the context of optical sensing.en_US
dc.language.isoenen_US
dc.publisherSPIEen_US
dc.rights© 2018 SPIE.en_US
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en_US
dc.sourceChemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XIX
dc.titleEnhanced whispering gallery mode sensorsen_US
dc.typeArticleen_US
dc.contributor.departmentUniv Arizona, Coll Opt Scien_US
dc.contributor.departmentUniv Arizonaen_US
dc.identifier.journalChemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XIXen_US
dc.description.collectioninformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.en_US
dc.eprint.versionFinal published versionen_US
refterms.dateFOA2020-11-06T03:03:09Z


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