1. Optics and Photonics Technology Laboratory, Ecole Polytechnique Fédérale de Lausanne, Rue de la Maladière 71b, CH-2002 Neuchâtel, Switzerland
2. Friedrich-Schiller-Universität Jena, Institute of Applied Physics, Abbe Center of Photonics, D-07743 Jena, Germany
3. Friedrich-Schiller-Universität Jena, Institute of Applied Physics, Abbe Center of Photonics, D-07743 Jena, GermanycFraunhofer Institute for Applied Optics and Precision Engineering, D-07745 Jena, Germany
4. SUSS MicroOptics SA, Rouges-Terres 61, 2068 Hauterive, Switzerland