Last modified: 2018-07-25
Abstract
Magneto photonic crystals (MPCs) give the possibilities for optical signal modulation via external magnetic fields through magneto-optical effects. They provide significant enhancement of the magneto-optical effects, such as Faraday and Kerr effects, with relatively small optical losses. These noticeable optical properties of the MPCs are used for high-sensitive biosensors and magnetic field detectors [1].Ferrite materials with garnet structures have impact on the electronic industry because of their application in diverse technological fields and devices, such as in isolators, phase shifters, oscillators, IC fabrications, sensors, antennas, etc.. The efficiency and performance of these devices have been improved using the yttrium iron garnet ferrites (Y3Fe5O12, YIG) [2], which have been widely applied for circulators, isolators, phase shifters, nonlinear devices... [3]. Given that YIG has large Faraday rotation and high saturation magnetization, this ferromagnetic garnet can be potentially applied in electronic devices with a high melting point, large resistivity, high electromagnetic properties, high thermal stability, low thermal expansion, high chemical stability, and high thermal conductivity [2].Magnetic fluid (MF) is a kind of stable colloidal mixture of magnetic nanoparticles dispersing in a suitable fluid carrier. MF possesses both the features of the magnetism of a solid ferromagnetic matter and the fluid behavior of a liquid matter with various attractive magneto-optical properties including tunable refractive index (RI), magnetically controllable birefringence [4]. In this work, we proposed a magnetic photonic crystal fiber (MPCF) with a triangular lattice of air holes, filled with MF (F3O4) at several external magnetic ï¬elds strength and at Temperature T=60°C [5] in YIG fiber at λ = 1.55 μm. An analysis of the magneto photonic properties of the structure such mode conversion, Faraday rotation, and modal birefringence is reported using the Beam Propagation Method (BPM). The mode conversion efficiency introduced by the gyrotropy and the coupling length are also investigated for TE and TM polarizations. This study shows a large Faraday rotation and small modal birefringence which improves the performance of optical isolators.from the results,a novel isolator based on YIG MPCF is developed.