Surface exciton-plasmons and optical response of small-diameter carbon nanotubes |
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Authors: | I V Bondarev K Tatur and L M Woods |
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Institution: | (1) Warsaw University of Technology, Narbutta 84, 02-524 Warsaw, Poland |
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Abstract: | We study theoretically the interactions of excitonic states with surface electromagnetic modes of small-diameter (≲1 nm) semiconducting
single-walled carbon nanotubes. We show that these interactions can result in strong exciton-surface-plasmon coupling. The
exciton absorption lineshape exhibits the line (Rabi) splitting ∼0.1–0.3 eV as the exciton energy is tuned to the nearest
interband surface plasmon resonance of the nanotube so that the mixed strongly coupled surface plasmon-exciton excitations
are formed. We discuss possible ways to bring the exciton in resonance with the surface plasmon. The exciton-plasmon Rabi
splitting effect we predict here for an individual carbon nanotube is close in its magnitude to that previously reported for
hybrid plasmonic nanostructures artificially fabricated of organic semiconductors deposited on metallic films. We expect this
effect to open up paths to new tunable optoelectronic device applications of semiconducting carbon nanotubes. |
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