Detection of Salmonella bacterium in drinking water using microring resonator

Abstract

A new microring resonator system is proposed for the detection of the Salmonella bacterium in drinking water, which is made up of SiO₂-TiO₂ waveguide embedded inside thin film layer of the flagellin. The change in refractive index due to the binding of the Salmonella bacterium with flagellin layer causes a shift in the output signal wavelength and the variation in through and drop port's intensities, which leads to the detection of Salmonella bacterium in drinking water. The sensitivity of proposed sensor for detecting of Salmonella bacterium in water solution is 149 nm/RIU and the limit of detection is 7 × 10^{− 4}RIU.

Keywords::

• bio-sensor
• bacteria sensor
• micro-optical device
• micro resonator
• molecular device
• small scale optics

Acknowledgments

We would like to thank the Institute of Advanced Photonics Science, Nanotechnology Research Alliance, Universiti Teknologi Malaysia (UTM) and King Mongkut's Institute of Technology (KMITL), Thailand, for providing research facilities.

Declaration of interest

The authors report no declarations of interest. The authors alone are responsible for the content and writing of the paper.

This research work has been supported by Flagship Research Grant Q.J130000.2509.06H46.