Silicon Slot Waveguide Based Optical Sensor

Abstract

This bachelor thesis explores basically the use of silicon slot waveguide in optical sensing area. Now a day Silicon Slot waveguides are highly used as optical sensor, this sensor are getting more and more interesting and important part of our life. This importance encouraged us to study and work with the Si-slot waveguide optical sensors. In winter season country people most of the time keep the window and door closed. Which increase the CO2 level in their house and it causes sometimes children’s death. If we detect the CO2 level by using optical sensor then we can reduce children’s death. Prawn cultivate gives our country huge remittance. Salinity level maintain important challenge for our prawn pond. If salinity level increases in our prawn pond then we face complication and losses. So we need to control salinity level in our prawn pond. We can control salinity level by using optical sensors. We used Si-slot waveguide optical sensors to detect presence of CO2 in air, CH4 in air, to detect level of salinity in sea water and also detecting molecule in medical test sector. In this thesis we have simulated and analyzed fundamental mode of silicon slot waveguide using Comsole Multiphysics simulation software. We also discussed about Finite Element Method (FEM) and given literature review on mostly related to our topic. Also, here we studied different types of slot waveguide based sensors and conducted and present the simulations by using Si slots over silica substrate. These simulation were performed mainly to detect the presence of CO2 and (Methane) in air and concentration of salinity and the results are discussed thoroughly.