Comparison between one layer and bilayer surface plasmon resonance optical fiber chemical sensor
DOI:
https://doi.org/10.31257/2018/JKP/2020/120205Keywords:
surface Plasmon resonance , plastic optical fiber , chemical sensorAbstract
Surface Plasmon Resonance (SPR) - based plastic optical fiber has been provided as a sensor to estimate the refractive index and then the concentration of specific chemical samples. Two configurations were suggested for the design. The first was through using a single layer of gold with a thickness of about 40nm deposited on a 10mm portion in the middle of plastic optical fiber. In the second configuration, a bilayer is deposited on the fiber. This bilayer consisted of a gold layer with a thickness of about 30 nm and an aluminum layer with a thickness of about 30 nm. Both of these configurations are utilized as chemical sensors. The resonance wavelength for the bilayer-based sensor was higher than that of the single-layer sensor for all studied chemical samples. The highest resonance wavelength was for the salt-water solution with a concentration of 30%. For the salt-water solution with a concentration of 30%, the resonance wavelength with the bilayer-based sensor was 568nm while it was 540nm with the single-layer sensor.
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Copyright (c) 2023 Soudad S. Ahmed
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