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A Graphical User Interface for Modeling the Optical Properties of Coated Metal Nanoparticles


H. A. Elmikaty, A. S. Samra, B. B. Yousif


Vol. 11  No. 3  pp. 177-182


This paper presents a graphical user interface, based on modified long-wavelength approximation method (MLWA) to compute the optical properties of core-shell nanoparticles. The validity of this technique is verified by comparison to the exact solution (Mie theory). For core-shell nanoparticles, when the shell thickness of a core-shell particle is decreased, the plasmon resonance shifts to longer wavelengths. This red shift is accompanied by an increase in peak intensity. For coated spherical particles, we confirm that our approach yields a correspondence with Mie theory and gives an approximation error of less than 2.8% for silica-gold and silica-silver particles with outer diameters approaching 40nm and 26nm and inner diameters approaching 38nm and 24nm respectively. Also the MLWA can give an acceptable degree of accuracy 4.92% for larger particles of silica-gold with (inner-outer) diameters 68-70nm at surface plasmon resonance wavelength 1573nm. For this simulation run, the computation time was less than 150.050 ms (Intel Pentium 4 CPU at 3GHz, 1.00GB of RAM), which includes calculation of the polarizability and all three cross-section plots of absorption, scattering and extinction. This simulator provides a useful guide tool for optical characterization experiments.


optical properties, coated nanoparticles, surface plasmon resonance, numerical simulation