文摘
We have performed a systematic study of magnetoplasmonic Au/Co/Au nanorods with different long/short axes ratio arranged in a disordered fashion but with the same spatial orientation of their axes. We show that the magneto-optical response can be tuned from the visible to the near-infrared range by changing the long/short axes ratio. Moreover, the analysis of the magnetic field induced polarization conversion indicates a different behavior for the far field and for the near field. In particular, the far-field polarization conversion of the nanorod does not depend on the incident polarization, whereas the near field does. This anticipates direct consequences for near-field interactions, since the interacting elements at different spatial positions could give rise to different magneto-optical responses.