The Research Of Regulation Characteristics Of One-dimensional Photonic Crystal With The Magnetic Fluid

The size of magnetic fluid refractive index are not only related to concentrations of magnetic fluid and dielectric layers thickness but also related to external circumstances. That is, the characteristics of regulation for magnetic fluid refractive index. The magnetic fluid is added in one-dimensional photonic crystal. The localized modes of photonic crystal are controlled by changing the size and direction of magnetic fields, ambient temperature and dielectric layers thickness. The regulation characteristics of one-dimensional photonic crystal with magnetic fluid are studied by transfer matrix method.First, the characteristics of magnetic field regulation in one-dimensional magnetic fluid photonic crystal localized mode with a defect layer are studied. The structural model of one-dimensional magnetic fluid photonic crystal localized mode with a defect layer is established.The transmission spectrum of one-dimensional magnetic fluid photonic crystal with a defect layer and the quality factor of localized mode change with structural layers and dielectric layers thickness are numerically simulated by transfer matrix method. By the picture analysis, based on the characteristics of magnetic field regulation for the magnetic fluid index refraction, applied magnetic field is increasing and the localized mode wavelength is decreasing. The maximum variation of the localized mode wavelength is not relevant to the photonic crystal periodicity. The localized mode wavelength moves to long-wave with the increasing of the dielectric layer thickness when the refractive index is constant; The quality factor of localized mode increases with the increasing of the photonic crystal periodicity and dielectric layer thickness; The variation of localized mode wavelength increases with the increasing of dielectric layer thickness.Second, temperature dependent of one-dimensional photonic crystals of magnetic fluid with a defect layer is studied. One-dimensional photonic crystal of magnetic fluid with a defect layer is built by Temperature tunable performance of nanoparticle magnetic fluid. The transmission spectrum of one-dimensional photonic crystals with a defect layer is numerically simulated by transfer matrix method. The result shows that the wavelength of defect modes shifts to the side of short waves with increasing temperature, its maximum variation is 16 nm. When the temperature range is 35oC-80 oC, the wavelength of defect modes change linearly with temperature, and the temperature sensitivity is 0.35nm/oC. The quality factor of the defect modes has the trend of increasing as the temperature rises, meanwhile it has small volatilities.Finally, the characteristics of magnetic field regulation in doping one-dimensional magnetic fluid photonic crystal with a defect layer are studied. The effective dielectric constant ε_liq of magnetic fluid is related to the volume fraction of the magnetic nanoparticles and the factor ^aⅡ of magnetic field. Firstly, the changing relation of water-based MnFe₂O₄ nanoparticle magneticfluid effective refractive index as the changing of which are the volume fraction of the magnetic nanoparticles and the factor of magnetic field is calculated. It is found that though the factor ^aⅡ of magnetic field is adjusted. To realize the magnetic fluid has the same effective refractive index in difference of volume fraction of the magnetic nanoparticles. And then, the transmission spectrum of doping one-dimensional water-based MnFe₂O₄ magnetic fluid photonic crystal, the volume fraction of the magnetic nanoparticles is 0.745, is numerically simulated by transfer matrix method. The results indicate that the wavelength of defect mode shifts to the side of long waves as the increased of nanoparticle magnetic fluid effective refractive index. That is, the wavelength of defect modes increased as the effective refractive index of magnetic fluid increasing. The amount of redshift is 36.6nm. At last, the quality factor of defect mode is disscused. We found out that half the peak bandwidth is a constant. The quality factor of defect mode and the wavelength of defect mode have the same characteristics of linear with the change of the effective refractive index of magnetic fluid. That is, the quality factor of the defect mode increased as the effective refractive index of magnetic fluid increasing.