1. Program of Physics, Faculty of Science and Technology, Pibulsongkram Rajabhat University, Phitsanulok, Thailand;
2. Advanced Materials Research Unit, Faculty of Science, King Mongkut’s Institute of Technology Ladkrabang, Bangkok, Thailand;
3. Department of Physics, Faculty of Science, Naresuan University, Phisanulok, Thailand;
4. Research Center for Academic Excellence in Applied Physics, Faculty of Science, Naresuan University, Phitsanulok, Thailand