1. Max Planck Institute for the Science of Light, 91058 Erlangen, Germany
2. Department of Physics, Friedrich-Alexander University Erlangen-Nürnberg, 91058 Erlangen, Germany
3. Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warsaw, Poland
4. Erlangen Graduate School in Advanced Optical Technologies (SAOT), Friedrich-Alexander University Erlangen-Nürnberg, 91052 Erlangen, Germany