The head of the polarimetric group of the Laboratory of Physics of Interfaces and Thin Films (LPICM) at École polytechnique, France, Dr. Antonello De Martino, passed away on August 23, 2014, after 35 years of a brilliant research career (see Fig. 1). He was an alumni of the École polytechnique French engineering school, and a senior scientist 1st class at the National Centre of Scientific Research (CNRS). He was also a professor in the Physics Department of École polytechnique. Antonello, as he was known to his colleagues and friends, started his career at Quantum Optics Laboratory in 1980, working on the generation of far-infrared (IR) radiation, IR multiphoton absorption, and the interaction of gas clusters with surfaces. In 2000 he joined the group of polarimetric optical instrumentation of LPICM. Antonello, who had acquired great expertise in using polarized light for detection of resonance-enhanced multiphoton ionization, was able to see the potential of Mueller matrix polarimetry experiments for a number of practical uses. Pushing the limits, he led the development of new polarimetric instruments and applications.