Polarized Magnetic Induced Broadening of Plasmon-photonics in Fe$_{3}$O$_{4}$- Silicone Elastomer Composite Films

We report systematic studies of polarization dependence of magneto-optical response of Fe$_{3}$O$_{4}$-silicone elastomer composite. The Fe$_{3}$O$_{4}$ particles were aligned in the elastomer matrix with static magnetic field. The optical response of two composites containing 5wt{\%} and 15wt{\%} of 20nm-30nm diameter Fe$_{3}$O$_{4}$ particle aligned in- and out-of-plane were measured with an absorption spectrometer. We observed a systematic redshift in the optical response of the out-of-plane samples with increasing static magnetic field. Furthermore, the observed redshift increases with increasing weight percent of Fe$_{3}$O$_{4}$ in the composite; obtaining a maximum shift of $\sim $ 174 nm at 600 Gauss in the 15wt{\%} Fe$_{3}$O$_{4}$-elastomer composite films. The observed redshift in the optical response of the out-of-plane composite is attributed to the effect of magnetic field strength and the metal particle/cluster size in the elastomer. However, there were no observable shifts in the in-plane samples, suggesting that the orientation (polarization) of the magnetic dipole and the induced electric dipole play a crucial role in the optical response.