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Magnetic field sensors using magnetophotonic crystals
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2006
Year
Magnetic PropertiesOptical MaterialsEngineeringMagnetic ResonanceFused QuartsMagnetic MaterialsMagnetic SensorMagnetismMagnetoplasmonicsOptical PropertiesMagnetic Thin FilmsInstrumentationMagnetic SensorsMagnetic Field SensorsMaterials SciencePhysicsPhotonic MaterialsMagnetophotonic CrystalsMagnetic MeasurementYttrium Iron GarnetMagnetic MaterialOptical SensorsSensorsNatural SciencesApplied PhysicsThin FilmsMagnetic PropertyMagnetic Field
In this work, we investigated the possibility of application of magnetophotonic crystals to the optical magnetic field sensor. The structure of 1D-MPC was (Ta<sub>2</sub>O<sub>5</sub>/SiO<sub>2</sub>)<sup>5</sup>/Bi:YIG/ (Ta<sub>2</sub>O<sub>5</sub>/SiO<sub>2</sub>)<sup>5</sup> (magnetic material as a defect layer between two Bragg reflectors) on a fused quarts substrate using RF magnetron sputtering apparatus. We used Bismuth substituted yttrium iron garnet (Bi:YIG) polycrystal film as a defect layer, because Bi:YIG is well known as the magnetic material with effective MO properties, even if it is polycrystal. Due to specially designed structure, the localized mode appeared at the wavelength of 880 nm, which is tunable by the thickness of multi layers or defect layer. At the wavelength of localized mode, Faraday rotation was shown large enhancement of 1.5°, that is fifty times larger than for single Bi:YIG polycrystal film of the same thickness.