1. Department of Electrical and Computer Engineering, Texas A&M University, College Station, Texas 77843, USA
2. Center for Ultrafast Science and Technology, Key Laboratory for Laser Plasmas (Ministry of Education), School of Physics and Astronomy, and Collaborative Innovation Center of Inertial Fusion Sciences and Applications (CICIFSA), Shanghai Jiao Tong University, Shanghai 200240, China
3. School of Medicine, University of California, Irvine, California 92697, USA