Multipole Resonance Modes in Localized Surface Plasmon of Single Hexagonal/Triangular Gold Nanoplates

We investigated the optical properties of the hexagonal/triangle gold nanoplates by single particle spectroscopy. By comparison with scanning electron microscope (SEM) observations, we successfully demonstrated that light scattering spectra of the hexagonal nanoplates with 360 ± 120-nm edge lengths and the triangular ones of 190 ± 60 nm exhibited two peaks in visible–near infrared region corresponding to quadrupole and higher multipole modes of localized surface plasmon resonance (LSPR).