Optofluidic sensor for measuring water salinity

Abstract

Water salinity analysis is critical for water quality monitoring and evaluation in order to guarantee water safety. Unregulated salinity may be harmful to human health, crops, industry, and the ecosystem. The salinity levels in water sources are constantly changing as a result of natural and anthropogenic ecological change. Exceeding specific salt levels might endanger human health, particularly through drinkable water. In this work, we present a simulation of an optofluidic sensor to measure the water's salinity. We built a design to measure the change in the refractive index in a microfluidic channel based on the dielectric grating. The generated design was modelled to alleviate the manufacturing process of the microfluidic sensor of the saline water. The design was optimized for the range of measurements of the refractive index of saline water by the selection of the material of the sensor.

High sensitivity meta-surface plasmonic sensor

“…The reflection spectrum will exhibit a very sharp drop for this specific wavelength. The resonance wavelength is very sensitive to changes of the effective index, which is very sensitive to changes of the refractive index of the surrounding medium [15][16][17][18][19][20][21][22][23] .…”

Infrared sensing using metasurface with Dolmen plasmonic nanostructures

“…We used the DGTD (Discontinuous Galerkin Time-Domain) lumerical solver to perform the numerical simulations, as it offers higher accuracy than the FDTD (Finite Difference Time-Domain) lumerical solver, due to the different meshing conditions required by the latter. We also investigated the effect of changing the environmental index, which corresponds to the salinity concentration in water, from 1.33, 1.335, 1.338, and 1.34 [31,32]. Furthermore, we performed a parametric sweep over all the dimensions of the structure to optimize the performance and achieve the highest sensitivity and the narrowest spectrum peak (Low FWHM).…”