Abstract
Conventionally, tuning magneto-optical Kerr rotation via the excitation of surface plasmons (SPs) usually results in extremely low light energy at the Kerr null point position in the optical spectrum. Realizing independent control of the magneto-optical effect is considered as an effective solution. The decoupling between the Kerr effect and optical response is achieved in our constructed Ag/Co composite nanogratings, and the Kerr rotation used as the refractive index sensing signal can be obtained without SP excitation. The refractive index sensing performance is improved by reducing electron collision frequency in Ag/Co nanogratings and the figure of merit reaches 96/RIU, far exceeding that of Co nanogratings.
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