Modeling the morphology-dependent optical properties of single and dimer Pt nanodendrite structures

The optical properties of Pt nanodendrites prepared by the electrochemical method are investigated and modeled by the finite-element method (FEM). Experimentally, localized surface plasmon resonance (LSPR) peaks are observed. The three-dimensional (3D) calculations of the single Pt dendrite model demonstrate that the LSPR "hot spot" is localized at the branch-trunk junctions and turned out to be more pronounced with increasing longitudinal plasmon resonance mode, accompanied by a significant enhanced electric field induced by sharp morphology features. We find that the LSPR of the nanodendrites is inherently sensitive to dimensions and configuration, thus providing the guidelines for developing new LSPR dendritic materials.