1. Laboratory
of Nanophotonics and Metamaterials, ITMO University, St. Petersburg, Russia
2. Department
of Electrical and Computer Engineering, The University of Texas at Austin, Austin, Texas 78712, United States
3. Laboratory
of Renewable Energy Sources, St. Petersburg Academic University, St. Petersburg, Russia
4. Nonlinear
Physics Centre, Australian National University, Canberra ACT 2601, Australia