Sensing of refractive index by using guided mode resonance 1D TiO₂ grating at visible wavelength under normal incidence

The effects of guided mode resonance (GMR) are largely used in optical communications because of its accurate line width and good capability. Specially study of titanium dioxide (TiO₂) gratings on glass substrate exhibit very low losses and can have excellent diffraction abilities along annihilation ratios. In this study a significant refractive index sensing by using the grating mode resonance in a simple 1D TiO₂ dielectric gratings. The resonant peak produced through structural asymmetry chosen as sensing probe. The narrow line width of resonance peak boosts the figure of merit. We presented excellent sensing results can be continued over a broadband range in visible region with comparatively large deviations in grating depth and period. Simulation shows the sensor possessing RI sensitivities of 352.57 nm/RIU and FOMs of 1176 for resonant peak. This GMR-based dielectric sensor device which is easy for manufacture is anticipated to show great declaration for achieving broadband refractive index sensors with better performance.