Simulation of Surface Plasmon Waves Based on Kretschmann Configuration Using the Finite Element Method
This paper presents the simulation of optically activated surface plasmon waves based on Kretschmann configuration by using prism. Simulated electric fields of the surface plasmon wave which appears at the interface between the metal thin film and dielectric layer are observed. The occurences of surface plasmon wave can be applied to biomolecular sensing and high speed data communications at the THz level. The simulations employ the finite element method (FEM). The light source is the 632.5 nm red laser which is economical and easy to obtained commercially. Two simulation models are conducted. The first simulation model employs copper thin film on the prism and air as the dielectric layer. This one is intended to find the most suitable copper thin film thickness to produce surface plasmon waves. Copper thin film is used because it is a noble metal which is less expensive than gold but has better conductivity than gold. The second simulation model employs silver, another noble metal which is also less expensive than gold. Silver thin film on prism together with magnesium chloride solution as dielectric layer are simulated. Concentrations of the magnesium chloride solution are varied to find the one which produces good surface plasmon wave pattern. Thus suitable to be used as sensors for biomoleculars such as DNAs.
KeywordsSurface plasmon wave Kretschmann configuration Finite Element method Copper thin film Silver thin film
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