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    Molecular Plasmonics

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    Author
    Cui, Yao
    Date
    2016-12-16
    Advisor
    Nordlander, Peter; Halas, Naomi
    Degree
    Doctor of Philosophy
    Abstract
    Graphene supports surface plasmons that have been observed to be both electrically and geometrically tunable in the midto far-infrared spectral regions. In particular, it has been demonstrated that graphene plasmons can be tuned across a wide spectral range spanning from the mid-infrared to the terahertz. The identification of a general class of plasmonic excitations in systems containing only a few dozen atoms permits us to extend this versatility into the visible and ultraviolet. As appealing as this extension might be for active nanoscale manipulation of visible light, its realization constitutes a formidable technical challenge. We experimentally demonstrate the existence of molecular plasmon resonances in the visible for ionized polycyclic aromatic hydrocarbons (PAHs), which we reversibly switch by adding, then removing, a single electron from the molecule. The charged PAHs display intense absorption in the visible regime with electrical and geometrical tunability analogous to the plasmonic resonances of much larger nanographene systems. Finally, we also use the switchable molecular plasmon in PAHs to demonstrate a proof-of-concept low-voltage electrochromic device.
    Keyword
    Plasmonics; polycyclic aromatic hydrocarbons; photonics; graphene; plasmon-phonon coupling
    Citation
    Cui, Yao. "Molecular Plasmonics." (2016) Diss., Rice University. https://hdl.handle.net/1911/96007.
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    • Rice University Electronic Theses and Dissertations [13403]

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    Managed by the Digital Scholarship Services at Fondren Library, Rice University
    Physical Address: 6100 Main Street, Houston, Texas 77005
    Mailing Address: MS-44, P.O.BOX 1892, Houston, Texas 77251-1892
    Site Map