1. State
Key Laboratory of Luminescence and Applications, Changchun Institute
of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, 3888 East Nanhu Road, Changchun 130033, P. R. China
2. University of Chinese Academy of Sciences, Beijing 100000, P. R. China
3. State
Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine
Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, P. R. China
4. Advanced Materials
Laboratory, Sandia National Laboratories, P.O. Box 5800
MS1349, Albuquerque New Mexico 87185-1349, United States
5. Center
for Micro-Engineering and Materials, Department of Chemical and Nuclear
Engineering, University of New Mexico, Albuquerque, New Mexico 87106, United States