Converging lasing from floating GaN Penrose microcavity Gangyi Zhu, Siqing He, Mengyao Zhou, Guoqing Qiu, Ming Fang, Jialei Yuan, Jitao Li and Yongjin Wang EPL, 127 2 (2019) 24001 Published online: 15 August 2019 DOI: 10.1209/0295-5075/127/24001