فهرست نشریات علمی دسترسی آزاد ایران

The objective of this study is to propose a methodology for examining how the size of metal nanoparticles, specifically gold, silver, copper, and titanium dioxide affects the optical properties of chalcogenide glasses. To achieve this, spherical nanoparticles with a volume fraction below 0.1, to minimize their interaction, are dispersed within the glasses. By employing the T-matrix method, the effective dielectric constant (EDC) of the composite medium is determined as a function of nanoparticle size (radius) and volume fraction at 635nm wavelength. The corresponding diagrams are plotted to illustrate the outcomes. Finally, the findings reveal a substantial increase in the EDC of the composite medium as the radius of the nanoparticles grows, particularly when the volume fraction of the nanoparticles is increased. For instance, in the case of a 635nm wavelength and a volume fraction of 0.08, the magnitude of EDC exhibits a pronounced dependence on both the radius and type of nanoparticles. Specifically, when the nanoparticle radius is 10nm, the minimal EDC is observed with silver nanoparticles, whereas the maximal EDC is manifested with gold nanoparticles. Conversely, at a radius of 50nm, the minimal EDC is realized with gold nanoparticles, while the maximal EDC is attained with silver nanoparticles. Lastly, at a 100nm radius, the minimal EDC is associated with silver nanoparticles, and the maximal EDC is elicited by titanium dioxide nanoparticles