1. Center for Physical Sciences and Technology (FTMC), Saulėtekio 3,Terahertz Photonics Laboratory,Vilnius,Lithuania,10257
2. University of Eastern Finland,Center for Photonics Sciences,Department of Physics and Mathematics,Joensuu,Finland,80101
3. Center for Physical Sciences and Technology (FTMC), Savanoriu ave. 231,Laser Microfabrication Laboratory,Vilnius,Lithuania,LT-02300