Role of avoided crossing and weak value amplification on enhanced Faraday effect in magnetoplasmonic systems

Abstract Enhancement of magneto-optical effects in hybrid magneto-plasmonic systems has attracted considerable recent attention because their potential for building non-reciprocal nanophotonic devices. Quantitative understanding the fundamental origin and contributing mechanisms enhancement is crucial optimizing applications. Here, we unravel different physical origins giant Faraday rotation ellipticity a system, namely, waveguided crystal excitation with transverse electric (TE) magnetic (TM) polarized light. With TE polarization excitation, where surface plasmons are not directly excited, natural weak value amplification appearing due to spectral domain interference Fano resonance dominant cause enhancement. For TM on other hand, waveguide-plasmon strong coupling its universal manifestation avoided crossing plays an important role, leading maximum regime.