Morphology dependence of nanoparticle-on-mirror geometries: A quasinormal mode analysis Kalun Bedingfield, Eoin Elliott, Nuttawut Kongsuwan, Jeremy J. Baumberg and Angela Demetriadou EPJ Appl. Metamat., 9 (2022) 3 Published online: 10 February 2022 DOI: 10.1051/epjam/2022002