Plasmonic Nanocomposites for Optical Fiber pH Sensor | Chapter 3 | Current Perspective to Physical Science Research Vol. 9

Recent strides in fiber-optic sensor (FOS) technology have expanded its utility across diverse fields, measuring an array of properties from chemical changes to light intensity. Fiber optic pH sensors stand out for their compactness and remote sensing capabilities. Plasmonic nanoparticles, specifically silver and gold, exhibiting localized surface plasmon resonance (LSPR), hold promise for pH monitoring, as their optical properties respond to factors like refractive index and pH. Our study contributes to this landscape by developing a pH sensor utilizing an Ag-PVA nanocomposite on U-bent fibers, with a comparative analysis against bulk Ag/PVA-coated fibers. This work aligns with the broader trend of advancing pH sensing technologies through innovative materials and methodologies, providing insights for enhanced performance in various applications.

Author(s) Details:

Dr. Rajib Saikia,
Department of Physics, Sibsagar University, Sivasagar, Assam, India.

Please see the link here: https://stm.bookpi.org/CPPSR-V9/article/view/14311

Fiber-optic Microfluidic Platform for Refractive Index Measurement of Liquids and Suspensions | Chapter 8 | Fundamental Research and Application of Physical Science Vol. 5

 We present a microfluidic terrace based on a fiber-visual three-way Mach-Zehnder interferometer (MZI), proposed to measurement of the refractive index (RI) of liquids and description of suspended jug particles (cylinders) simultaneously. The calculation principle is established low coherence interferometry, place the maximum position of the interferogram Gaussian envelope  depends on the ocular path difference (OPD) betwixt the measuring and the remark arm of the MZI. An algorithm was developed for manipulative the refractive index of liquids and mirror particles, as well as for judgment the particle width from the raw photodetector signals. The physical atom diameter is planned from the measured particle transportation time while passing through the test beam. We erect very good understanding between the experimental results and the article data on the checked liquids refractive index and dimensions and refractive index of postponed particles. The veracity of the refractive index measurement was about 1 %, mainly contingent upon the accuracy of position review of the mechanical scanner. The littlest sample volume maybe as small as 1 µl is capable of weighing the refractive index of different fluids and gases and their suspensions simultaneously. The projected method is appealing for label-free biological, biochemical and chemical grasping because of allure high sensitivity and veracity and  self-calibrating feature.

Author(s) Details:

Zoran Djinovic,
ACMIT Gmbh, Austrian Center for Medical Innovation and Technology, 2 Viktor Kaplan Str., Wiener Neustadt-2700, Austria.

Milos Tomic,
Institute of Technical Sciences of SASA, 35 Knez Mihailova, Belgrade-11000, Serbia.

Please see the link here: https://stm.bookpi.org/FRAPS-V5/article/view/10651