Integrated 3D Hydrogel Waveguide Out-Coupler by Step-and-Repeat Thermal Nanoimprint Lithography: A Promising Sensor Device for Water and pH. - Achille Francone; Timothy Kehoe; Isabel Obieta; Virginia Saez-Martinez; Leire Bilbao; Ali Z. Khokhar; Nikolaj Gadegaard; Claudia Delgado Simao; Nikolaos Kehagias; Clivia M. Sotomayor Torres (Sensors, 2018)