In this project, we aim to achieve enhanced collective molecular emission through the coupling with nano-structured metallic surfaces. We will first theoretically (numerically) investigate, understand and design nano-structures able to favor the collective optical response of an ensemble of quantum emitters. Next, several types of metallic substrates will be obtained via bottom-up approaches for studying the collective optical response of an ensemble of fluorophores, i.e. the increased collective decay rates, and finally to apply our full new understanding to explore some niche advanced application (e,g, sensing, new light sources, smart anticounterfeiting tags). From a scientific point of view, this project has a potential impact on a fundamental understanding of light-matter interactions. It will lead to the acquisition of new and significant knowledge in the field of photonics (plasmonics in particular), advanced materials, and collective emission in such materials. The realization of the expected results can broadly benefit fundamental science, including chemistry, optics, and physics and lead to interdisciplinary breakthroughs in optics and plasmonics. For education, our project is beneficial to foster first-class research within a culture of innovation and collaboration between Romania and France, two European countries.