Polymer waveguide thermo-optical switch with loss compensation based on NaYF4: 18% Yb3+, 2% Er3+ nanocrystals*

Project supported by the National Natural Science Foundation of China (Grant Nos. 61475061 and 61575076).

Xing Gui-Chao, Zhang Mei-Ling, Sun Tong-He, Fu Yue-Wu, Huang Ya-Li, Shao Jian, Liu Jing-Rong, Wang Fei, Zhang Da-Ming
       

(color online) (a) Preparation process of the TO switch and (b) SEM image of the waveguide cross-section.