1. Electronics Laboratory; Department of Information Technology and Electrical Engineering; ETH Zürich; Gloriastrasse 35 8092 Zürich Switzerland
2. Group for Molecular Engineering of Functional Materials; Institute of Chemical Sciences and Engineering; École Polytechnique Fédérale de Lausanne; Rue de l'Industrie 17, Case postale 440 1951 Sion Switzerland
3. Laboratory for Photonics and Interfaces; Institute of Chemical Sciences and Engineering; École Polytechnique Fédérale de Lausanne; Station 6 1015 Lausanne Switzerland