1. Ruhr University Bochum, Photonics and Terahertz Technology, Universitätsstr. 150,Bochum,Germany,44801
2. Ruhr University Bochum, Molecular Genetics and Physiology of Plants, Universitätsstr. 150,Bochum,Germany,44801
3. Fraunhofer Institute for Telecommunications, Heinrich Hertz Institute, Einsteinufer 37,Berlin,Germany,10587