Direct laser writing of barriers with controllable permeability in porous glass

Abstract

© 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement. Barriers were produced in porous glass through its local bulk density modification by direct femtosecond writing accompanied by CO2-laser surface thermal densification, to make functional microfluidic elements separated by such physical barriers with different controlled permeability. The separation of multi-component solutions into individual components with different molecule sizes (molecular separation) was performed in this first integrated microfluidic device fabricated in porous glass. Its application in the environmental gas-phase analysis was demonstrated.