1. Department of PhysicsTechnical University of MoldovaChisinauMD-2004Republic of Moldova
2. Ferdinand-Braun-Institut, Leibniz-Insitut für HöchstfrequenztechnikGustav-Kirchhoff-Str. 412489BerlinGermany
3. Weierstrass InstituteMohrenstrasse 3910117BerlinGermany
4. Eagleyard Photonics GmbHRudower Chaussee 2912489BerlinGermany