[13a-B409-1~10] 3.12 Nanoscale optical science and near-field optics

[13a-B409-4] Inteparticle-separation dependency of femtosecond transient optical responses in dolmen-type Au nanostructure

〇Atsushi Sugita¹, Kanta Mochizuki¹, Atsushi Ono¹, Wataru Inami¹, Yoshimasa Kawata¹, Masayuki Yoshizawa² (1.Shizuoka Univ., 2.Tohoku Univ.)

Keywords:assembled Au nanoparticle system, coordinated plasmon mode, femtosecond time-resolved spectroscopy

We will present femtosecond time-resolved spectroscopy for a dolmen-type Au nanostructures. The dolmen-type Au nanostructure consisted of three rectangular Au nanorods. Two of them were arrayed in parallel and the third was located perpendicular to the dimer. The structures had two hybridized plasmonic modes through the near-field coupling. The interparticle near-field interactions depended on the gap separation between the monomer and the dimer. The nanostructures with different gap separations were prepared. Upon photo-exciation of one of the mode, the transient change was induced in the other mode. We found that the transient change occurred in the long-range as far as 100 nm.