[1] Nankai Univ, Sch Phys, Minist Educ, Key Lab Weak Light Nonlinear Photon, Tianjin 300071, Peoples R China
[2] Nankai Univ, Coll Elect Informat & Opt Engn, Tianjin 300071, Peoples R China
[3] Nankai Univ, Tianjin Key Lab Photoelect Thin Film Devices & Te, Tianjin 300071, Peoples R China