Photon-field-shape effects on Rabi splitting energies in CuCl microcavities Toshiki Kawase, Kenichi Miyazaki, DaeGwi Kim and Masaaki Nakayama Eur. Phys. J. B, 86 2 (2013) 69 Published online: 25 February 2013 DOI: 10.1140/epjb/e2012-30505-4