文献类型：期刊文献

英文题名：Wide tunable lasing in photoresponsive chiral liquid crystal emulsion

作者：Zheng, Zhi-gang[1,2];Liu, Bo-wei[1];Zhou, Lu[1];Wang, Wei[1];Hu, Wei[2];Shen, Dong[1]

机构：[1]E China Univ Sci & Technol, Dept Phys, Shanghai 200237, Peoples R China;[2]Nanjing Univ, Coll Engn & Appl Sci, Natl Lab Solid State Microstruct, Nanjing 210093, Jiangsu, Peoples R China

年份：2015

卷号：3

期号：11

起止页码：2462

外文期刊名：JOURNAL OF MATERIALS CHEMISTRY C

收录：;EI(收录号：20151300688120);WOS:【SCI-EXPANDED(收录号:WOS:000350984200004)】；

基金：This work is sponsored by the National Science Foundation of China (grant no. 61435008, no. 61108065), the Chen-guang Talent Foundation of Shanghai Education and Development Committee (grant no. 12CG32), and the Foundation of Laboratory of Solid State Microstructures, Nanjing University (grant no. M27005).

语种：英文

外文关键词：Molecular structure - Substrates - Emulsification - Laser tuning - Liquid crystals - Molecules

摘要：A new tunable laser based on a photoresponsive chiral liquid crystal emulsion is reported. Such a laser can be reversibly photo-tuned in a wide spectral range of 112 nm (566-678 nm), and it simultaneously possesses stable emission performance and quasi-continuous tunability. Typically, unlike the conventional liquid crystal laser, the proposed laser can be fabricated by simply coating the material on a single substrate, which will simplify the production process and broaden the application of liquid crystal laser. In addition, the mechanisms of tunability are explored on a molecular scale. The studies reveal that the molecular conformation transition of a photosensitive chiral switch during isomerization leads to changes in not only the molecular geometry and the direction of dipole moment, but also the molecular interactions and the miscibility of the materials. These changes cause the rearrangement of liquid crystals, thus rendering the variation of helical twisted power and achieving tuning on the photonic band-edge of the chiral liquid crystal, consequently forming a photo-tunable laser.