1. Department of Electronics and Telecommunications, University of Engineering and Technology, Vietnam National University, Hanoi, Vietnam
2. Institute of Physics, Vietnam Academy of Science and Technology, Hanoi, Vietnam
3. Department of Mechanical Engineering, National Chung Cheng University, Chia-Yi, Taiwan, R.O.C.
4. Center for Electronics and Telecommunications Research, University of Engineering and Technology, Vietnam National University, Hanoi, Vietnam