Fluorescence enhancement and strong-coupling in faceted plasmonic nanocavities Nuttawut Kongsuwan, Angela Demetriadou, Rohit Chikkaraddy, Jeremy J. Baumberg and Ortwin Hess EPJ Appl. Metamat., 5 (2018) 6 Published online: 04 June 2018 DOI: 10.1051/epjam/2018004