1. Department of PhysicsNational Taiwan University Taipei 106 Taiwan
2. Nanoscience and Technology ProgramTaiwan International Graduate ProgramAcademia Sinica Taipei 115 Taiwan
3. Institute of Optoelectronic SciencesNational Taiwan Ocean University Keelung 202 Taiwan
4. Molecular Science and Technology ProgramTaiwan International Graduate ProgramAcademia Sinica Taipei 115 Taiwan