1. Photonics4Life research group, Departamento de Física Aplicada, Facultade de Física, Campus Vida, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain
2. Department of Physics, Chalmers University of Technology, SE-41296 Gothenburg, Sweden
3. Institute of Applied Physics, Russian Academy of Sciences, Nizhny Novgorod 603950, Russia
4. Lobachevsky State University of Nizhny Novgorod, Nizhny Novgorod 603950, Russia