1. Nanotechnology Engineering, Faculty of Advanced Technology and Multidiscipline, Universitas Airlangga, Surabaya, Indonesia
2. Department of Electrophysics, National Yang Ming Chiao Tung University, Hsinchu, Taiwan
3. Department of Physics, National Tsinghua University, Hsinchu, Taiwan
4. Design and Manufacture Engineering, Shipbuilding Institute of Polytechnic Surabaya, Surabaya, Indonesia
5. Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Malang, Indonesia