Integration of indium micromirrors for biosensing applications

Metallic mirrors are important components of opto-microfluidic systems for their ability to reflect light. Their use, however, has been limited by the challenges of their integration to microfluidic devices. Here the authors describe the fabrication of indium micromirrors integrated to microfluidic devices and successfully demonstrate their application to the determination of fluorescein concentration in aqueous solutions by absorbance measurements. The technological route presented here for integrating metallic mirrors to microfluidic devices is fast, simple and inexpensive.