Department of Physics, Tampere University of Technology, Tampere, Finland.|Department of Physics, Tampere University of Technology, Tampere, Finland.|Department of Physics, Tampere University of Technology, Tampere, Finland.|Department of Physics, Tampere University of Technology, Tampere, Finland.|Department of Physics, Tampere University of Technology, Tampere, Finland.|Department of Physics, Tampere University of Technology, Tampere, Finland.|Department of Physics, Tampere University of Technology, Tampere, Finland.|Department of Physics, Tampere University of Technology, Tampere, Finland.