D3.4 - Development of a Lab-on-a-Chip for Detection of Bacteria in Food Samples
- Event
- AMA Conferences 2013
2013-05-14 - 2013-05-16
Nürnberg - Band
- Proceedings SENSOR 2013
- Chapter
- D3 - Cell Sensing
- Author(s)
- S. Mitra, D. Sarkar - University of Alberta, Edmonton (Canada), I. Jamal - AQL Management Consulting Inc., Edmonton (Canada)
- Pages
- 525 - 530
- DOI
- 10.5162/sensor2013/D3.4
- ISBN
- 978-3-9813484-3-9
- Price
- free
Abstract
We developed an optical biosensor of nanodimensions, for the detection of bacteria in food samples, which has an integrated Mach-Zehnder Interferometer (MZI) configuration. MZI works on the principle of total internal reflection having a sensor arm, where the bacteria is to be bound by biofunctionalization, and a reference arm. The MZI is fabricated on a silicon substrate with silicon nitride (Refractive index=2.00) acting as the core and silicon dioxide (Refractive index=1.46) acting as the upper and lower cladding. Light from a laser source (He-Ne) will be coupled into the waveguide having the MZI configuration which is split into the two arms, then after a certain distance, they recombine again. This is done by using a diverging and converging Y-junction, respectively. The design of the MZI has been created using simulations in order to get a monomodal propagation of light with minimal losses. The Y-junctions have been designed so as to allow the divergence and convergence of the propagating light with a 3dB split ratio.