The Interparticle Coupling Effect on Plasmon Resonance Properties of Magnetite@Au Magnetoplasmonic Nanoparticles

Publication date: 2015 Source:Procedia Materials Science, Volume 11 Author(s): N. Ahmadi, R. Poursalehi, M.K. Moravvej Farshi Magnetoplasmonics based on Composite nanostructure, has been used in sensing, optical devices and optical switching. Magnetite@Au core@shell nanostructure exhibits both plasmonic and magnetic properties and holds promise for using in biomedical applications. The ability to control optical properties of magnetite@Au over a broad spectral range and adjustable composite thickness make these nanostructures an important subject for magnetoplasmonic studies. In this research, interparticle coupling effect on plasmon resonance properties of magnetite@Au magnetoplasmonics nanoparticles by using finite element method has been calculated. In addition optical characteristic of magnetite@Au strongly depend on size, surrounding medium and pitches between the particles. The effects of these parameters on optical properties of magnetite@Au nanostructures have been studied. The calculated results show plasmon resonance absorption peak has changed from 576nm to 540nm by decreasing size of Au coating from 5nm to 17nm. Moreover, by increasing magnetite core diameter from 10nm to 25nm, wavelength of maximum plasmon resonance absorption has been changed 590nm to 620nm. As the refractive index of medium around magnetite@Au increasing, results have shown a red shift absorption peak which the peak position linearly depends on the refractive index of medium. The effe...
Source: Procedia Materials Science - Category: Materials Science Source Type: research