Microfiber sensors for monitoring ambient gas and fine particulate matters

Real-time sensing for gas, liquid, and fine particulate matter are challenging to optical fibers since the probe light cannot interact with the molecules or particle directly. One approach of extending fiber based system to gas or fine particulate matter sensing is taking the advantage of evanescent field that is generated around a microfiber. We report our progress in fluoride microfiber environmental sensor based on the absorption or scattering properties of the generated evanescent field.