Volume 108, Number 3, November 2014
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||04 November 2014|
Modeling the morphology-dependent optical properties of single and dimer Pt nanodendrite structures
1 School of Materials Science and Engineering, Shanghai University - Shanghai 200072, China
2 Institute of NanoMicroEnergy, Shanghai University - Shanghai 200444, China
3 Department of Physics, College of Science, Shanghai University - Shanghai 200444, China
4 Department of Chemistry, College of Science, Shanghai University - Shanghai 200444, China
5 National Key Laboratory of Science and Technology on Micro/Nano Fabrication, Department of Micro/Nano Electronics, Shanghai Jiao Tong University - Shanghai 200240, China
Received: 19 August 2014
Accepted: 12 October 2014
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.
PACS: 73.20.Mf – Collective excitations (including excitons, polarons, plasmons and other charge-density excitations) / 62.23.St – Complex nanostructures, including patterned or assembled structures / 78.20.Bh – Theory, models, and numerical simulation
© EPLA, 2014
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