1. Aston University, School of Engineering and Applied Sciences, Aston Institute of Photonic Technologies, Birmingham B4 7ET, United Kingdom
2. State University—Education-Science-Production Complex, Biomedical Photonics Instrumentation Group, Scientific-Educational Centre of “Biomedical Engineering,” Oryol 302020, Russia
3. Aston University, Optoelectronics and Biomedical Photonics Group, Aston Institute of Photonic Technologies, Aston Triangle, Birmingham B4 7ET, United Kingdom