1. Department of Mechanical Engineering, School of Engineering, University of Birmingham, Birmingham B15 2TT, UK e-mail:
2. Max Bergmann Center of Biomaterials, Leibniz Institute of Polymer Research, Dresden 01069, Germany
3. ALPhANOV, Technological Centre for Optics and Lasers, Optic Institute of Aquitaine, Talence 33400, France; CELIA, University of Bordeaux, CNRS—CEA UMR5107, Talence 33405, France
4. Department of Mechanical Engineering, School of Engineering, University of Birmingham, Birmingham B15 2TT, UK
5. ALPhANOV, Technological Centre for Optics and Lasers, Optic Institute of Aquitaine, Talence 33400, France