1. Department of Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Ganesha 10, Bandung 40132, Indonesia
2. Research Center for Biomaterials, Indonesian Institute of Sciences, Jl. Raya Jakarta-Bogor KM 46 Cibinong, Bogor 16911, Indonesia
3. Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Sebelas Maret, Ir. Sutami 36, Surakarta 57126, Indonesia