Dynamics of the photoexictation of azo dye-doped liquid crystals probing by pumped attenuated total reflection

Kuang-Yao Lo, Chia Yi Huang

研究成果: Conference contribution

摘要

Kinetics of the photoexcitation of azo-dye doped liquid crystals (ADDLCs) is observed by the improved attenuated total reflection leading a pump light into a coupling prism, namely pumped ATR (PATR) experiment. The technique of ATR could be applied on an LC cell based on that the guide mode is overcome by the usage of an isotropic surface, which is also a usual way to observe the reaction involving the adsorption effect. The evanescent wave of the pump light induces the photoexcitation of azo dye at the limited effective depth, and the evanescent wave of the probe light detects the dynamic behavior in real time. The time response of the photoexcitation in ADDLCs in the pumped ATR experiment is less than 2ms and believed the reaction occur in the local region of 100 nm. This result is a witness of that the reaction in this local region is free of the influence of the elastic continuum of the whole LC cell. With the help of the local sensitivity and local disturbance, the detailed reactions during the photoexcitation process are clearly observed and the dynamics equation are expressed to illustrate the oscillation phenomena of LC directors as the pump light irradiates on this region.

原文English
主出版物標題Liquid Crystals and Applications in Optics
DOIs
出版狀態Published - 2007 十一月 23
事件Liquid Crystals and Applications in Optics - Prague, Czech Republic
持續時間: 2007 四月 172007 四月 18

出版系列

名字Proceedings of SPIE - The International Society for Optical Engineering
6587
ISSN(列印)0277-786X

Other

OtherLiquid Crystals and Applications in Optics
國家Czech Republic
城市Prague
期間07-04-1707-04-18

    指紋

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

引用此

Lo, K-Y., & Huang, C. Y. (2007). Dynamics of the photoexictation of azo dye-doped liquid crystals probing by pumped attenuated total reflection. 於 Liquid Crystals and Applications in Optics [65870R] (Proceedings of SPIE - The International Society for Optical Engineering; 卷 6587). https://doi.org/10.1117/12.722110