Unconventional control of excited states of a dimer molecule by a localized light field between metal nanostructures

Authors

  • Takuya Iida,

    Corresponding author
    1. Department of Physics and Electronics, Osaka Prefecture University, 1-1, Gakuen-cho, Nakaku 599-8531, Sakai, Osaka, Japan
    2. PRESTO, Japan Science and Technology Agency, 4-1-8, Honcho, Kawaguchi, Saitama 332-0012, Japan
    • Phone: +81-72-254-9268, Fax: +81-72-254-9268
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  • Hajime Ishihara

    1. Department of Physics and Electronics, Osaka Prefecture University, 1-1, Gakuen-cho, Nakaku 599-8531, Sakai, Osaka, Japan
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Abstract

We have made a theoretical study of the spatial interplay between the localized light field (LLF) and the electronic wavefunction of molecules. When the LLF has a nanoscale spatial variation comparable to a molecular wavefunction, this interplay is crucial to determine the optical response of molecular excited states. Such a condition can be realized in case that a molecule is lying in the vicinity of a metal nanogap. By using the calculation method applicable to arbitrary-shaped samples, we demonstrate a drastic enhancement of the response electromagnetic field from an optical forbidden state whose magnitude is comparable to that from an allowed state. The obtained result indicates that we have a possibility to control the excited states of molecules by designing the LLF with metal nanostructures. (© 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

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