1. Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai, Thailand
2. Graduate School, Chiang Mai University, Chiang Mai, Thailand
3. Science and Technology Research Institute, Chiang Mai University, Chiang Mai, Thailand
4. Department of Applied Physics, Faculty of Sciences and Liberal Arts, Rajamangala University of Technology Isan, Nakhon Ratchasima, Thailand