1. International Iberian Nanotechnology Laboratory (INL); Av. Mestre Jose Veiga 4715-330 Braga Portugal
2. State Key Laboratory of Silicate Materials for Architectures; Wuhan University of Technology; Wuhan 430070 P. R. China
3. State Key Laboratory of Information Photonics and Optical Communications, and School of Science; Beijing University of Posts and Telecommunications; Beijing 100876 P. R. China