Microscopy assisted fabrication of a hydrogel-based microfluidic filter A. Caliò, J. Leng, J. Decock, L. De Stefano and J. B. Salmon J. Eur. Opt. Soc.-Rapid Publ., 10 (2015) 15058 Published online: 16 December 2015 DOI: 10.2971/jeos.2015.15058