Electron-phonon relaxation dynamics of hot electrons in gold nanoparticles

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dc.contributor.advisorLink, Stephan
dc.creatorBruncz, Autumn Rose
dc.date.accessioned2024-01-24T21:35:57Z
dc.date.available2024-01-24T21:35:57Z
dc.date.created2023-12
dc.date.issued2023-10-26
dc.date.submittedDecember 2023
dc.date.updated2024-01-24T21:35:57Z
dc.description.abstractWe report on a pump wavelength-dependent study of the electron-phonon relaxation in colloidal solutions of isolated gold nanospheres and nanorods. We varied the pump wavelength from 400 to 800 nm to cover interband, plasmon, and intraband excitations in 40 nm gold nanospheres with a plasmon resonance at ~525 nm, as well as in 34×91 nm gold nanorods with longitudinal plasmon resonance at 720 nm. We also performed an excitation fluence dependence study at each pump wavelength and plotted the measured plasmon bleach recovery kinetics against change in electronic temperature. These plots were all linear and revealed as the intercept of zero excitation power the intrinsic electron-phonon relaxation time, which we found to be independent of pump wavelength and hence the same regardless of how the nanoparticles were excited. Similarly, the slopes of the excitation power dependencies varied remained constant, from taking into account the absorption spectra of each nanoparticle sample. The plasmon bleach recovery dynamics at a given excitation fluence simply describe the collective cooling of a hot thermalized electron distribution with the lattice to reach thermal equilibrium and are longer the larger the initial temperature rise.
dc.format.mimetypeapplication/pdf
dc.identifier.citationBruncz, Autumn Rose. "Electron-phonon relaxation dynamics of hot electrons in gold nanoparticles." (2023). Master's thesis, Rice University. https://hdl.handle.net/1911/115385
dc.identifier.urihttps://hdl.handle.net/1911/115385
dc.language.isoeng
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.
dc.subjectplasmonics
dc.subjecthot electrons
dc.subjectgold nanoparticles
dc.titleElectron-phonon relaxation dynamics of hot electrons in gold nanoparticles
dc.typeThesis
dc.type.materialText
thesis.degree.departmentElectrical and Computer Engineering
thesis.degree.disciplineEngineering
thesis.degree.grantorRice University
thesis.degree.levelMasters
thesis.degree.nameMaster of Science
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