Ultra-wide band reflective metamaterial wave plates for terahertz waves Shaojie Ma, Xinke Wang, Weijie Luo, Shulin Sun, Yan Zhang, Qiong He and Lei Zhou EPL, 117 3 (2017) 37007 Published online: 31 March 2017 DOI: 10.1209/0295-5075/117/37007