Figure 11

(a) Schematic diagram of an optofluidic chip for liquid concentration measurement. The optofluidic chip is filled with liquid and a white light probe is coupled to the entrance facet of the waveguide. The light transmitted by the waveguide propagates inside the microfluidic channel and is then reflected at the tilted wall of the left reservoir, where the absorption spectra of liquids are measured. (b) Design of the optofluidic chip as illustrated in (a). Note that the inner surface of microchannel is coated with polymer.¹¹² Reproduced with permission from RSC. ©2012 by the Royal Society of Chemistry.