Waveguide thickness effects on the sensitivity of lamellar grating waveguide sensor with TE-polarization incidence

This paper has studied the effects of waveguide thickness on the sensitivity of the sub-wavelength Lamellar grating waveguide sensor with TE polarization incidence. The variation of guided modes and the sensitivity of fundamental mode are also investigated. The calculation results show that the thicker waveguide layer will induce more guided modes. Comparing the spectrum sensitivity of fundamental mode of different waveguide thickness, the peak shift of the thinner waveguide layer is larger than the thicker one's. In other words, thinner waveguide layer is a better selection for the use of sensor.