Investigation on the optical characteristic of magnetic fluid film in the presence of an external magnetic field

A model for studying the optical feature of the magnetic fluid films is developed based on the simulated microstructures. The spectral transmittivity of the magnetic fluid film is computed by using Monte Carlo method and the effect of an external magnetic field on the spectral transmittivity is investigated. The results show that when the external magnetic field is perpendicular to the magnetic fluid film, the spectral transmittivity of the film increases with the increase of the field strength. But while the external magnetic field is parallel to the film, the spectral transmittivity doesn't change with altering the field strength and the local spectral transmittivity of the film presents rectangle wave distribution feature.