1. Leibniz Institute of Photonic Technology, Albert-Einstein-Strasse 9, 07745 Jena, Germany
2. National Institute of Optics (INO), National Research Council (CNR), Largo E. Fermi 6, 50125 Florence, Italy
3. European Laboratory for Non-Linear Spectroscopy (LENS), University of Florence, Via Nello Carrara 1, 50019 Sesto Fiorentino, Italy
4. Mechano(bio)chemistry, Max Planck Institute of Colloids and Interfaces, Am Mühlenberg 1, 14476 Potsdam, Germany
5. Institute of Physical Chemistry, Friedrich Schiller University, Helmholtzweg 4, 07743 Jena, Germany
6. Abbe Center of Photonics, Friedrich Schiller University, Albert-Einstein-Strasse 6, 07745 Jena, Germany