1. Molecular
Imaging Center, National Taiwan University, Taipei 10617, Taiwan
2. Department of Electrical Engineering
and Graduate Institute of Photonics and Optoelectronics, National Taiwan University, Taipei 10617, Taiwan
3. Department of Physics and Center
for Nanoscience and Nanotechnology, National Sun Yat-Sen University, Kaohsiung 80424, Taiwan
4. Research Center for Applied
Sciences and Institute of Physics, Academia Sinica, Taipei 11529, Taiwan