2016•Optics ExpressOpen access

Diffraction grating-based sensing optofluidic device for measuring the refractive index of liquids

Sergio Calixto, Neil C. Bruce, Martha Rosete-Aguilar

Abstract

We describe a simple and versatile optical sensing device for measuring refractive index of liquids. The sensor consists of a sinusoidal relief grating in a glass cell. Device calibration is done by pouring in the cell different liquids of known refractive indices. Each time a liquid is poured first order intensity is measured. The fabrication process and testing of the prototype device is described. An application in the measurement of temperature is also presented.

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Available abstract

Key concepts: Refractive index, Optics, Materials science, Grating, Calibration, Diffraction grating, Fabrication, Diffraction efficiency