Interaction between excitons and surface plasmons in a carbon nanotube covered with gold nanoblocks Light irradiation to gold nanoblocks with a nanometer-scale gap causes strong near fields at the gap region. We performed numerical simulations of optical excitation of carbon nanotubes which are located on the gap of the gold nanoblocks. It is revealed that excitons moving along the nanotube are excited and optical absorption of the gold nanoblocks is suppressed due to the excitons. Electric-field distributions near a gap of gold nanoblocks. (Left) White solid and dashed lines denote cross sections of gold nanotublcks and carbon naotubes, respectively. (a) Result in the absence of nanotube. A strong near field occurs due to surface plasmons of the nanoblocks. (b) Result taking account of excitons of the nanotube where interactions between the exciton and plasmon are not included. (c) Result in the case where interactions between the exciton and plasmon are considered. (Right) (Upper row) Top view of the system. (Middle row) Result of difference between (b) and (a). Excitation of the exciton moving along the nanotube increses the electric field near the gap. (Lower row) Reulst of difference between (c) and (a). The electric field is suppressed due to interactions between the exciton and plasmon. Back
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