Author Affiliations

Viktor Dremin,^a,b,* Alexander Bykov,^a Zbignevs Marcinkevics,^c Andris Grabovskis,^d Evgeny Zherebtsov,^a,b Alexey Popov,^a and Igor Meglinski^a

^aOptoelectronics and Measurement Techniques Unit, University of Oulu, Erkki Koiso-Kanttilankatu 3, 390014, Oulu, Finland

^bResearch & Development Center of Biomedical Photonics, Orel State University, Komsomolskaya Str. 95, 302026, Orel, Russia

^cDepartment of Human and Animal Physiology, University of Latvia, Jelgavas str. 1, LV-1004, Riga, Latvia

^dBiophotonics Laboratory of Institute of Atomic Physics and Spectroscopy, University of Latvia, Jelgavas str. 3, LV-1004, Riga, Latvia

^*Corresponding author: viktor.dremin@oulu.fi