Characterization of single nanoparticles

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dc.contributor.authorJones, Steven
dc.contributor.supervisorGordon, Reuven
dc.date.accessioned2016-07-20T14:50:36Z
dc.date.available2016-07-20T14:50:36Z
dc.date.copyright2016en_US
dc.date.issued2016-07-20
dc.degree.departmentDepartment of Electrical and Computer Engineering
dc.degree.levelMaster of Applied Science M.A.Sc.en_US
dc.description.abstractOptical trapping is a method which uses focused laser light to manipulate small objects. This optical manipulation can be scaled below the diffraction limit by using interactions between light and apertures in a metal film to localize electric fields. This method can trap objects as small as several nanometers. The ability to determine the properties of a trapped nanoparticle is among the most pressing issues to the utilization of this method to a broader range of research and industrial applications. Presented here are two methods which demonstrate the ability to determine the properties of a trapped nanoparticle. The first method incorporates Raman spectroscopy into a trapping setup to obtain single particle identification. Raman spectroscopy provides a way to uniquely identify an object based on the light it scatters. Because Raman scattering is an intrinsically weak process, it has been difficult to obtain single particle sensitivity. Using localized electric fields at the trapping aperture, the Raman integrated trapping setup greatly enhances the optical interaction with the trapped particle enabling the required sensitivity. In this work, the trapping and identification of 20 nm titania and polystyrene nanoparticles is demonstrated. The second method uses an aperture assisted optical trap to detect the response of a magnetite nanoparticle to a varying applied magnetic field. This information is then used to determine the magnetic susceptibility, remanence, refractive index, and size distribution of the trapped particle.en_US
dc.description.proquestcode0544en_US
dc.description.proquestcode0752en_US
dc.description.proquestemailstevenjones3.14@gmail.comen_US
dc.description.scholarlevelGraduateen_US
dc.identifier.bibliographicCitationJones, S., Al Balushi, A. A. & Gordon, R. Raman spectroscopy of single nanoparticles in a double-nanohole optical tweezer system. Journal of Optics 17, (2015).en_US
dc.identifier.bibliographicCitationHaitian, X., Jones, S., Choi, B.-C. & Gordon, R. Characterization of Individual Magnetic Nanoparticles in Solution by Double Nanohole Optical Tweezers. Nano Letters 16, 2639–2643 (2016).en_US
dc.identifier.urihttp://hdl.handle.net/1828/7409
dc.languageEnglisheng
dc.language.isoenen_US
dc.rightsAvailable to the World Wide Weben_US
dc.rights.urihttp://creativecommons.org/licenses/by/2.5/ca/*
dc.subjectRaman Spectroscopyen_US
dc.subjectOptical Trapping with Magnetic Fielden_US
dc.subjectNanoparticleen_US
dc.subjectNanoparticle Characterizationen_US
dc.subjectOptical Trappingen_US
dc.subjectAperture Assisted Optical Trappingen_US
dc.titleCharacterization of single nanoparticlesen_US
dc.typeThesisen_US

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