Magneto-optical tunability of magnetic fluid infiltrated microstructured optical fiber

In this paper, the magneto-optical properties of hexagon-hole microstructured optical fiber filled with magnetic fluid were investigated. The results indicate that the proposed device has excellent magnetic-field tunability and could be used in sensing area. The dispersion curves of different modes under various magnetic fields demonstrate the higher the intensity of magnetic field, the lower the refractive index of mode; the tunability of cladding modes is greater than that of core modes, and the tunability of higher order modes is greater than that of lower order modes. It shows that filled MOF could be used for the mode ON–OFF or single/multi-mode filters controlled by magnetic field. The transmission of the fiber decreases exponentially with increase of the magnetic field intensity, which permits filled MOF use as intensity-modulated magnetic-field sensors in high sensitivity magnetic-sensing area. The proposed magneto-optic tunable devices have several advantages of simple structure, high integration, easy fabrication, etc.

► Magneto-optical properties of microstructured optical fiber filled with magnetic fluid.
► Dispersion curves of different modes are analyzed under various magnetic fields.
► Transmission of the filled fiber decreases exponentially with increasing magnetic field intensity.