1. Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems; School of Physics; Beijing Institute of Technology; Beijing 100081 P. R. China
2. Elementary Educational College; Beijing Key Laboratory for Nano-Photonics and Nano-Structure; Capital Normal University; Beijing 100048 P. R. China
3. CRANN and AMBER; Trinity College Dublin; Dublin 2 Ireland
4. School of Chemistry; Trinity College Dublin; Dublin 2 Ireland
5. Nazarbayev University; 53 Kabanbai Batyra Ave. Astana 010000 Kazakhstan
6. Western Seoul Center; Korea Basic Science Institute; Seoul 03579 Republic of Korea
7. Chuncheon Center; Korea Basic Science Institute; Chuncheon 24341 Republic of Korea
8. Division of Industrial Metrology; Korea Research Institute of Standards and Science; Daejeon 305-340 Republic of Korea
9. Experimental School Affiliated to Haidian Teachers Training College; Beijing 100097 P. R. China
10. Institute of Plasma Physics; Chinese Academy of Sciences; Hefei 230031 P. R. China