1. Ph.D. Program in Applied Physics, Faculty of Science, Chiang Mai University, Chiang Mai, Thailand
2. Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai, Thailand
3. Department of Science, Faculty of Science and Agricultural Technology, Rajamangala University of Technology Lanna Lampang, Lampang, Thailand
4. Research Center in Physics and Astronomy, Chiang Mai University, Chiang Mai, Thailand