Three-dimensional micro-billiard lasers: The square pyramid M. A. Guidry, Y. Song, C. Lafargue, R. Sobczyk, D. Decanini, S. Bittner, B. Dietz, L. Huang, J. Zyss, A. Grigis and M. Lebental EPL, 126 6 (2019) 64004 Published online: 29 July 2019 DOI: 10.1209/0295-5075/126/64004