Assembly of fibre bragg grating with optical tweezers for continuous detection and trapping of micro-particles

Abstract

At present, detection and trapping of particles are separate tasks, which makes it a difficult and time-consuming function. In this work, we detected silicon particles in solution with Fibre Bragg Grating (FBG) model by implementing EME-FME simulation. Changes in force applied on silicon particles of different radii and at various distances from the centre of the source beam is observed by simulating an Optical Tweezer. Our results demonstrate the changes in electric and magnetic fields on presence of silicon particles, as well as an increase in optical force and peak shift in FBG. The optical force is shown to increase with particle distance from the centre of the beam by 1.37 10−24 N/μm. The Bragg wavelength of the FBG also demonstrates high sensitivity for particle detection, and shifts from 1.5 μm to 1.55 μm when a 5 μm particle is added. The proposed system can be implemented to fabricate lab-on-chip devices for the detection of high concentration of particles in water bodies, which contribute to turbidity and affect aquatic life.