Enhancement of magneto-optical Kerr response by LSPR in magneto plasmonic nanostructures for biological sensors

چکیده مقاله

In this paper, design and fabrication of Glass/Ni/Au nanoparticles (NPs)/ZnS magneto-plasmonic nanostructure have been nvestigated in order to develop biological sensors. The Au NPs were synthesized by a co-precipitation method, and a vapor eposition technique was used to fabricate the multi-layer nanostructure. The longitudinal Kerr signal (LKS) of nanostructure as been measured and tried to be enhanced, thereby improving sensitivity. The results show that adding the Au NPs surrounded y ZnS layer on Ni magnetic thin film leads to an increase in the Kerr signal up to 84% without altering the magnetic properties significantly. In fact, the LKS of Glass/Ni/ZnS has increased due to the localized surface plasmon resonance (LSPR) by Au NPs n the interface of Ni/ZnS, thus increasing light interaction with both the dielectric layer and magnetic layer.