Detection of Water-alcohol Content Using Surface Plasmon Resonance

A high-sensitivity surface plasmon resonance sensor (SPR) for alcohol detection is provided and examined in this work. The sensor’s structure is built up of layers that include silicon dioxide, BP, silver, BK7 prism, and sensing medium. A mixture of alcohol and water that has different alcohol concentrations makes up the sensing medium. To achieve excellent performance, geometrical parameters are modified, such as layer thickness. The proposed sensor performs exceptionally well in this regard, with a sensitivity of 400 deg/RIU, a signal-to-noise ratio of 0.02, a limit of detection of 6.5e⁻⁴, a quality factor equal 16.59, and a figure of merit of 76.70 RIU⁻¹. The suggested sensor can be a helpful tool for determining the amount of alcohol present in a particular medium according to these sensing features. The transfer matrix technique (TMM) is used to assess the sensor’s construction and performance characteristics.