  The integration of photonic sensors into microfluidic devices provides
opportunities for dynamic measurement of chemical and physical properties of
fluids in very small volumes. We previously reported on the use of commercially
available Fiber Bragg Gratings (FBGs) and on-chip silicon waveguides for
temperature sensing. In this report, we demonstrate the integration of FBGs
into easy-to-fabricate microfluidic devices and report on their sensitivity for
temperature and pressure measurement in microliter volumes. These sensors
present new routes to measurement in microfluidic applications such as
small-volume calorimetry and microflow metrology.
