Up-conversion luminescence polarization control in Er^(3+)-doped NaYF_4 nanocrystals  

作　　者：张晖 姚云华 张诗按 卢晨晖 孙真荣 

机构地区：[1]Institute of Science, Information Engineering University [2]State Key Laboratory of Precision Spectroscopy and Department of Physics, East China Normal University [3]College of Mechanical Engineering, Shanghai University of Engineering Science

出　　处：《Chinese Physics B》2016年第2期123-128,共6页中国物理B（英文版）

基　　金：Project supported by the Young Scientists Fund of the National Natural Science Foundation of China(Grant No.11304396);the National Natural Science Foundation of China(Grant Nos.11474096 and 51132004);the Shanghai Municipal Science and Technology Commission,China(Grant No.14JC1401500)

摘　　要：We propose a femtosecond laser polarization modulation scheme to control the up-conversion（UC） luminescence in Er^（3＋）-doped NaYF_4 nanocrystals dispersed in the silicate glass. We show that the UC luminescence can be suppressed when the laser polarization is changed from linear through elliptical to circular, and the higher repetition rate will yield the lower control efficiency. We theoretically analyze the physical control mechanism of the UC luminescence polarization modulation by considering on- and near-resonant two-photon absorption, energy transfer up-conversion, and excited state absorption, and show that the polarization control mainly comes from the contribution of near-resonant two-photon absorption. Furthermore, we propose a method to improve the polarization control efficiency of UC luminescence in rare-earth ions by applying a two-color femtosecond laser field.We propose a femtosecond laser polarization modulation scheme to control the up-conversion（UC） luminescence in Er^（3＋）-doped NaYF_4 nanocrystals dispersed in the silicate glass. We show that the UC luminescence can be suppressed when the laser polarization is changed from linear through elliptical to circular, and the higher repetition rate will yield the lower control efficiency. We theoretically analyze the physical control mechanism of the UC luminescence polarization modulation by considering on- and near-resonant two-photon absorption, energy transfer up-conversion, and excited state absorption, and show that the polarization control mainly comes from the contribution of near-resonant two-photon absorption. Furthermore, we propose a method to improve the polarization control efficiency of UC luminescence in rare-earth ions by applying a two-color femtosecond laser field.

关 键 词：up-conversion luminescence laser polarization nanocrystal 

分 类 号：O436.3[机械工程—光学工程] TB383.1[理学—光学]