Polymer waveguide thermo-optical switch with loss compensation based on NaYF4: 18% Yb3+, 2% Er3+ nanocrystals<xref rid="cpb_27_11_114218_fn1" ref-type="fn">*</xref><fn id="cpb_27_11_114218_fn1"><label>*</label>Project supported by the National Natural Science Foundation of China (Grant Nos. 61475061 and 61575076).</fn>

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) TEM photograph of NaYF₄: Er³⁺, Yb³⁺ nanocrystals and (b) emission characteristics of the nanocrystals under 980 nm wavelength laser excitation.