From weak to strong coupling with enhanced dualband magnetoplasmonic Kerr sensing in the dimer-grating metamaterial

We investigate the evolution of plasmonic spectral features from weak to strong coupling regime, with a large Rabi splitting of 210 meV, in the designed dimer-grating metamaterial. The two-driven coupled oscillator model has been proposed to quantitatively analyze the evolution, where the two oscillators are directly excited by the external driving light wave, demonstrating that the evolution is caused by not only aligning the resonance wavelength of related SP modes, but also low-loss. The proposed metamaterial is of high magnetoplasmonic refractive index sensitivity of 280.05 nm RIU−1 and figure of merit of 3*104 RIU−1, suggesting promising applications in biochemical sensing.