Electrically and thermally controllable nanoparticle random laser in a well-aligned dyedoped liquid crystal cell

Chia Rong Lee, Shih Hung Lin, Jin Wei Guo, Jia De Lin, Hong Lin Lin, Yang Chen Zheng, Chia Lien Ma, Chi Ting Horng, Han Ying Sun, Shuan Yu Huang

研究成果: Article同行評審

27 引文 斯高帕斯(Scopus)

摘要

This paper reports for the first time an electrically and thermally controllable nanoparticle (NP) random laser in a well-aligned dye-doped liquid crystal (DDLC) cell. Experimental results show that the random lasing emission is attributed to the amplification of the fluorescence via the multiple scattering of the randomly distributed NPs in the diffusion rout of the well-aligned DDLC cell. The random laser can be electrically and thermally controlled by varying the applied voltage and cell temperature, respectively. As the applied voltage is increased, the orientational change of the LCs from homogeneous to homeotropic texture decreases the dye absorption and thus the spontaneous fluorescence emission, resulting in the decrease of the random lasing emission. The random lasing intensity decreases with increasing temperature at the nematic phase and dramatically increases after the nematic→isotropic (N→I) phase transition. The result in the former stage is attributed to the decreases in the absorption and thus in the spontaneous fluorescence emission for the laser dyes because of the decrease in the order of the laser dyes with increasing temperature at the nematic phase. The result in the latter stage results from the significant decrease of the loss because of the disappearance for the strong leakage of the scattering fluorescence light through the boundaries of the LCs and the glass substrates after the N→I phase transition. Moreover, the anisotropy of the random lasing is crucially determined by two factors: the anisotropies in the spontaneous emission and the leakage of the scattering fluorescence light.

原文English
頁(從 - 到)1469-1481
頁數13
期刊Optical Materials Express
5
發行號6
DOIs
出版狀態Published - 2015

All Science Journal Classification (ASJC) codes

  • 電子、光磁材料

指紋

深入研究「Electrically and thermally controllable nanoparticle random laser in a well-aligned dyedoped liquid crystal cell」主題。共同形成了獨特的指紋。

引用此