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Enhancement of magneto-optical effects in hybrid magneto-plasmonic systemshas attracted considerable recent attention owing to their potential forbuilding non-reciprocal nanophotonic devices. Quantitative understanding on thefundamental origin and contributing mechanisms for the enhancement is extremelycrucial for optimizing applications. Here, we unravel the distinctly differentphysical origin of the giant enhancement of Faraday rotation and ellipticity ina hybrid magneto-plasmonic system, namely, waveguided magneto-plasmonic crystalfor excitation with transverse electric (TE) and transverse magnetic (TM)polarized light. With TE polarization excitation, where the surface plasmonsare not directly excited, the natural weak value amplification of Faradayeffects appearing due to the spectral domain interference of Fano resonance isthe dominant cause of the enhancement. For TM polarization excitation, on theother hand, waveguide-plasmon strong coupling and its universal manifestationof avoided crossing plays an intriguing role, leading to maximum enhancement ofthe magneto-optical effects in the avoided crossing regime.

Unravelling the role of waveguide-plasmon strong coupling, avoided  crossing and natural weak value amplification on the enhanced Faraday effect  in hybrid magneto-plasmonic systems