**About the Editor**

**Gr ´egory Barbillon** completed his PhD in Physics (2007) with greatest distinction at the University of Technology of Troyes (France). He then obtained his Habilitation (HDR) in Physics (2013) at the University of Paris Sud (Orsay, France). He has been a Professor of Physics at the Faculty of Engineering "EPF-Ecole d'Ingenieurs" (Sceaux, France) since his appointment in September ´ 2017. His research interests are focused on plasmonics, nano-optics, non-linear optics, biosensing, optical sensing, condensed matter physics, nanophotonics, nanotechnology, surface-enhanced spectroscopies, sum-frequency generation spectroscopy, materials chemistry, physical chemistry, and fluorescence.
