کنفرانس بین المللی میکروالکترونیک ایران

صفحه اصلی / هفتمین کنفرانس بین المللی میکروالکترونیک ایران

Investigation of Surface Plasmon Resonance and Light Scattering by Gold Nanoparticles in Air and Dielectric Environments

نویسندگان :

Habib Khoshsima¹ Reza Morsali²

1- دانشگاه تبریز 2- دانشگاه تبریز

کلمات کلیدی :

Surface plasmon polariton،Temperatures sensitivity،Metal-insulator-metal waveguide

چکیده :

This study investigates the optical response and localized electric energy distribution of a gold nanoparticle with a circular cross-section in both air and dielectric environments using numerical simulations. Initially, the nanoparticle’s scattering behavior in air was analyzed using FEM simulations, confirming that scattering intensity increases with particle size, consistent with Mie theory, and revealing a localized surface plasmon resonance (LSPR) peak at 572 nm. Subsequently, the nanoparticle positioned on a dielectric substrate was examined under electromagnetic wave illumination at varying incident angles and polarizations (TM and TE). The results demonstrate that the coupling of surface plasmons and the dielectric layer leads to enhanced electromagnetic field concentration, which strongly depends on the angle of incidence and the refractive index of the dielectric medium. TM polarization exhibited significant plasmonic excitation and field enhancement near the nanoparticle, whereas TE polarization showed negligible interaction with surface plasmons. Furthermore, the angle corresponding to minimum reflectance—and thus maximum energy penetration into the dielectric—shifts with changes in the refractive index. These findings contribute to the understanding of plasmonic behavior in nanoparticle-dielectric systems and have implications for designing efficient plasmonic sensors and photonic devices.