• strong coupling
• cavity polaritons
• photoswitchable molecules
• energy transport

Polariton mediated long range energy transport has been measured in different donor-acceptor systems including organic molecules such as J-aggregates and BODIPY dyes. Nevertheless, there is still a necessity of understanding at a deeper level how the transport actually happens, how the dark states and the environment coupling can influence it and if it is possible to control it by engineering the molecules undergoing strong coupling. In this thesis, the donor molecule is chosen to be photoisomerizable under UV and green light exposure to the purpose of controlling, through an external optical gate, the polariton formation and the energy transport. For this reason, Silver and DBR microcavities embedding spatially separated donor and acceptor molecules are designed, fabricated and optically characterized through angle resolved reflectivity, transmittivity and emission measurements.