Localized Surface Plasmon Resonance Imaging of Gold Nanostructures
Ting-Yun Chan1*, Yen-Chin Huang1, Pei-Chi Hong1, Fang-Yi Wen1, Yi-Chun Chen1
1Department of Physics, National Cheng Kung University, Tainan, Taiwan
* presenting author:詹婷云, email:L26021236@mail.ncku.edu.tw
Localized Surface Plasmon (LSP) is a polariton produced by an interaction of the photon and electrons in the material. When the electromagnetic wave irradiates on metallic particles, the free electrons could make a relative displacement to ionic lattice and generate collective oscillations. If the frequency of driving electromagnetic wave satisfies the resonance conditions, a strong localized electric field will be produced and the scatter waves will propagate to far fields. In this study, we manipulated gold particles with the size about 250 nm to construct nanostructures, and we used white light as an exciting source. The resonance frequencies change in different nanostructures and the resonant modes depend on the polarization of incident lights. In addition, we changed orientations of the incident light relative to the samples, which shows the effects of the geometric symmetry of nanostructure on the surface plasmon. These results demonstrate the tunable characteristics of LSP through varying nanosturctures.


Keywords: Localized surface plasmon , nanoparticles , nanostructures, polarization, far-field