Martynas is a Principal Research Fellow at the Optoelectronics Research Center. His work focuses on treating materials with ultra-fast pulses of light. He holds three patents, is the co-author of two book chapters, and has published more than 100 articles. In 2016, Martynas received a Research Fellowship from the Royal Academy of Engineering to develop technology to modify the properties of optical fibers extending their functionality. His research interests include fiber optic sensors, distributed sensing systems, miniature optical imaging and spectrometry systems.