Department of Physics;
Temple University;
Philadelphia;
Pennsylvania 19122;
USA;
Department of Electrical and Computer Engineering;
Temple University;
Philadelphia;
Pennsylvania 19122;
USA;
College of Science;
Minzu University of China;
Beijing 100044;
China;
Anhui Provincial Key Laboratory of Photonics Devices and Materials;
Anhui Institute of Optics and Fine Mechanics;
Chinese Academy of Sciences;
Hefei 230031;
China;