Boosting Faraday rotation in a one-dimensional coupled resonator magnetoplasmonics structure made by silica matrix doped with magnetic nanoparticles

Abstract

The present study aimed to evaluate the magneto-optic Faraday rotation of one-dimensional coupled resonator magnetoplasmonics structure by metallic cover layer in each resonator. To this purpose, transfer matrix method was used where crystals made by SiO2/ZrO2 or SiO2/TiO2 doped with magnetic nanoparticles using sol-gel process in different configurations and use and 10-nm thick gold or silver layer for the excitation of the surface plasmon polaritons (SPPs). Tamm plasmon are surface modes that result from forcing the field to be confined at the metal-dielectric interface via a method different from total internal reflection. Optical Tamm states can be formed in both the TE and TM polarization. Based on these modes, a wide range of wavelengths is detected by which the figure of merit increases due to the interaction of light with Tamm plasmon and surprisingly the flat optical window in this region in addition to the main resonance. These structures can open a new gate for enhancing performance of the magneto-optic devices.

Keywords

• Faraday rotation effect
• magneto-plasmonic structures
• Micro-cavity
• One-dimensional magneto photonic crystals
• Photonic band gap