Abstract
A novel optical sensor was designed for the measurement of salinity in seawater. The principle is to measure the refractive index variation of seawater that corresponds to the change in salinity. The sensor based on the two-dimensional photonic crystal (PhC) microcavity coupled to two waveguide. We have used the FDTD method to simulate the sensor in 2D PhC with triangular lattice of air holes. The influence of the geometrical parameter and refractive index on transmission are studied, and an enhancement in sensitivity in 2D PhC is achieved which proves the ability of the structure to produce salinity sensor using PhC.
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