Refractive index sensor based on magnetoplasmonic crystals

• The magneto-optical refractive index sensor based on magnetoplasmonic crystals was fabricated.
• The sensitivity of refractive index sensor was studied as a function of ferromagnetic layer thickness.
• The highest sensitivity of refractive index sensor was observed in magneto-optical modulation regime.

A magneto-optical surface plasmon resonance (MOSPR) sensor based on a magnetoplasmonic crystal trilayer structure is presented. The sensitivity of the MOSPR sensor is studied as a function of ferromagnetic layer thickness and at the different modes of operation. The enhancement of the sensitivity caused by using the MOSPR sensor in magneto-optical modulation regime in comparison with reflection regime is observed.