1. Division of Cryogenic Research, Scientific-Practical Materials Research Center NASB 220072 Minsk, Belarus
2. Department of Raman Spectroscopy (Center «Nanobiophotonics»), Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research Joliot-Curie Str. 6, 141980 Dubna, Russia
3. Functional Interfaces Department, Leibniz Institute of Photonic Technology Albert Einstein Str. 9, 07745 Jena, Germany