Computational and Experimental Study of Geometry Control of Metallic Nanostructures for Plasmonics Applications
Yi-Xiang Yang1*, Jinn P. Chu1
1Department of Materials Science and Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan
* Presenter:Yi-Xiang Yang,
Surface-enhanced Raman scattering (SERS) is a widely used analytical technique in plasmonics applications by utilizing rough surfaces of metallic substrates for enhancing the intensity of Raman signals of probe molecules. This experiment designed and fabricated metallic nanostructures with various geometries via finite-difference time domain (FDTD) simulation, lithographic processes, and magnetron sputtering. Palladium is chosen to be the material of metallic nanostructures in this study as it possesses advantageous properties of suitable dielectric constant under visible light irradiation and antioxidant activity of noble metals. The simulated electric field intensity distributions show that SERS of metallic nanostructures has strong dependence on geometry of nanostructures, polarization direction of incident laser and curvature of tips.

Keywords: metallic nanostructure, surface-enhanced Raman scattering (SERS), finite-difference time domain (FDTD), localized surface plasmon resonance (LSPR)