Preparation Of Large Faraday Effect Cerium Substitued YIG Magneto-optic Thin Films And Its Application Research

The magneto-optical devices which are based on Faraday magneto-optical effect are widely used in many research such as the optical communication,optical sensors and magneto-optical storage.More and more attentions have been paid to the methods of fabrication of magneto-optical materials and enhancement of Faraday rotation effect.With the development of the integrated optics,the mainstream of the microwave devices is low cost and miniaturization.The film magneto-optical materials have attracted much research due to the advantages of low production cost,simple structure,light in weight and small volume.Ferrimagnetic garnets are the only materials which have low optical absorption and excellent magneto-optical property in visible and near infrared light at the same time.Among them,yttrium iron garnet(YIG)series of membrane materials is the most studied and widely used type of magneto-optical material,specially the cerium doped YIG(CeYIG)film which has giant magnetic Faraday rotation effect is the research hotspot in recent years.In this paper,the main research work and innovation are as follows:To prepare thin film using pulsed laser deposition(PLD)technology,a qualified target should be prepared first of all.YIG target was prepared by solid phase method,the formulation and process parameters on the influence of density,magnetic the target.Then,YIG thin films were prepared by PLD method on quartz substrate,the phase,magnetic and magneto-optical properties were test of thin film prepared under different process parameters.Finally,we prepared CeYIG thin films with large Faraday effect on cheap quartz substrate with a rotation angle of-0.6 °/?m.Based on CeYIG thin film,we studied the mechanism of enhance Faraday magneto-optical effect and optical transmission rate of two different magneto-plasmonic photonic crysal structure.Using FDTD Solutions for studying the influence of structure parameters on the Faraday effect,thus analyzing the natureof this phenomenon.The simulation results show that change the period of Au film and the thickness of CeYIG film will change the response wavelength.At the same time,compared with the same thickness CeYIG films,the faraday rotation angle of the magneto-plasmonic photonic crysal can be improved more than 8 times,which has important reference value for making magneto-optical sensors and optical isolations.In this thesis,CeYIG films were studied systematically from theory,experiment and simulation three aspects for the first time.The technical difficulty that CeYIG films with huge faraday rotation angle cannot be prepared on quartz substrate traditionally was overcame.We combined the magneto-plasmonic photonic effect with magneto-optic effect for the first time,simulated the faraday rotation effect and the optical properties of the magneto-plasmonic photonic crysals which were based on CeYIG films.The results have important guiding significance for producting the filmy magnetic-optical sensing head and isolation devices.