Modelling and optimization of TiO2based two- dimensional photonic crystal for salinity detection in water

Abstract

In this article, we have presented a computational analysis of two-dimensional photonic crystals (2D- PCs) having circular and elliptical waveguide structures inside aTiO<inf>2</inf> host material for the salinity detection in the water. The band structure of the proposed 2D- PCs has been optimized for better salinity detection based on the number of circular and elliptical waveguiding pores taken in the PCs structure and changes in the radius of circular pores and for different major-minor axis of elliptical pores. The electric field profiles corresponding to these structures have also been plotted. The salinity detection sensitivity is calculated by computing the change in transmittance (∆T<inf>n<inf>1.333</inf>−n<inf>1.35</inf></inf>) corresponding to changes in refractive indices due to salinity in water. It is observed that maximum sensitivity is obtained corresponding to refractive indices, n<inf>1.333</inf>,n<inf>1.35</inf> which is equal to 0.9198 in the circular pore in the 2D-PCs structure. For the elliptical pore, the sensitivity is 0.8679. © 2024 Elsevier GmbH