Optimization of the nanoshell geometry for plasmon enhanced fluorescence

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dc.contributor.advisorHalas, Naomi J.en_US
dc.creatorTam, Feliciaen_US
dc.date.accessioned2009-06-03T21:07:52Zen_US
dc.date.available2009-06-03T21:07:52Zen_US
dc.date.issued2007en_US
dc.description.abstractMetal nanoshells possess plasmon resonances that are controlled by the geometry of the nanoparticle. Because nanoshell plasmon resonances can be readily predicted by the plasmon hybridization model or Mie scattering theory, it is possible to design a nanoshell to possess specifically chosen plasmonic properties. This thesis examines how to optimize the nanoshell geometry for various sensing applications. Although the nanoshell plasmon can be described within the quasistatic limit using plasmon hybridization, experimentally feasible nanoshell plasmons are also influenced by finite size effects. It is thus important to gain insight into the properties of the nanoshell plasmon in this mesoscopic regime in order to optimize the nanoshell geometry for applications such as the plasmon enhanced fluorescence. We examine the roles of the nanoparticle plasmon resonance energy and nanoparticle scattering cross-section on the fluorescent emission of indocyanine green (ICG). We find that enhancement of the molecular fluorescence is optimized when the nanoshell exhibits a large scattering cross section and a plasmon resonance energy which corresponds to the emission frequency of ICG. Another potential biomedical application for nanoshell is their use as surface plasmon resonance (SPR) sensors. We investigate the geometrical parameters that determine the sensitivity of an Au-nanoshell SPR sensor. It was found that the sensitivity of the nanoshell plasmon to its embedding medium depends primarily on total nanoshell size and less sensitively on core/shell ratio. It is clear from these studies that the efficacy of a nanoshell used in a particular application depends on more parameters than just the plasmon resonance energy.en_US
dc.format.extent64 p.en_US
dc.format.mimetypeapplication/pdfen_US
dc.identifier.callnoTHESIS PHYS. 2007 TAMen_US
dc.identifier.citationTam, Felicia. "Optimization of the nanoshell geometry for plasmon enhanced fluorescence." (2007) Diss., Rice University. <a href="https://hdl.handle.net/1911/20653">https://hdl.handle.net/1911/20653</a>.en_US
dc.identifier.urihttps://hdl.handle.net/1911/20653en_US
dc.language.isoengen_US
dc.rightsCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.en_US
dc.subjectPhysical chemistryen_US
dc.subjectCondensed matter physicsen_US
dc.titleOptimization of the nanoshell geometry for plasmon enhanced fluorescenceen_US
dc.typeThesisen_US
dc.type.materialTexten_US
thesis.degree.departmentPhysicsen_US
thesis.degree.disciplineNatural Sciencesen_US
thesis.degree.grantorRice Universityen_US
thesis.degree.levelDoctoralen_US
thesis.degree.nameDoctor of Philosophyen_US
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