1. Nonlinear
Physics Centre and Centre for Ultra-high bandwidth Devices for Optical
Systems (CUDOS), Research School of Physics and Engineering, The Australian National University, Canberra, ACT 2601, Australia
2. Center
for Integrated Nanotechnologies, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
3. V.N. Karazin Kharkiv National University, Kharkiv 61022, Ukraine
4. Institute
of Radio Astronomy, National Academy of Sciences of Ukraine, Kharkiv 61002, Ukraine