He pioneered mid-infrared antimonide-based photonics, participating in the very first developments in this field and later directing this research with the IOFFE Institute and with Montpellier. He guided innovative investigations resulting in the demonstration of novel types of mid-infrared semiconductor lasers, light-emitting diodes and photodetectors. He has more than 300 scientific publications, including more than 50 invited talks at international conferences. He is Editor of a book and author of four book chapters. His current research activity is focused on physics and technology of InAs-based quantum cascade lasers and interband cascade lasers. His research efforts have resulted in 20 patents on photonic devices and their technology. In 2006, his achievements in mid-infrared photonics have been recognized by the attribution of the Silver Medal of CNRS, one of the highest scientific awards in France. In 2017, he was elected Fellow of SPIE.