The controllable intensity and polarization degree of random laser from sheared dye-doped polymer-dispersed liquid crystal

Nanophotonics

article

Lihua Ye¹  Fangjie Li¹  Changgui Lu¹  Zhixiang Cheng¹  Guohua Hu¹  Yanqing Lu²  Yiping Cui¹ 

[1] Advanced Photonics Center, School of Electronic Science and Engineering, Southeast University;College of Engineering, Applied Sciences and National Laboratory of Solid State Microstructures, Nanjing University

关键词: polarization degree;    intensity;    shear;    controllable;    random laser;   

DOI  :  10.1515/nanoph-2017-0070

学科分类：社会科学、人文和艺术（综合）

来源: De Gruyter

【 摘 要 】

The random laser from sheared dye-doped polymer-dispersed liquid crystal (DDPDLC) is investigated. As the emission intensity weakens, the threshold of random laser from DDPDLC increases from 2.0 mJ/pulse to 4.0 mJ/pulse, and the degree of polarization (DOP) increases from 0.1 to 0.78, obviously when the shear distance increases from 0 mm to 4 mm. As the liquid crystal droplets are gradually oriented in the shear direction caused by alignment direction of polymer chain and anisotropy of droplet shape, the scattering intensity perpendicular to the shear direction gradually decreases and that parallel to the shear direction gradually increases. The anisotropic absorption of the laser dye also plays a certain role as the shear distance is 0 mm. The controllable intensity and polarization degree of random laser have a huge potential for sensing applications.

【 授权许可】

CC BY