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首页> 外文会议>Conference on multiphoton absorption and nonlinear transmission processes: Materials, theory, and applications >Single and two photon time resolved polarised fluorescence studies of probe molecule dynamics in nematic liquid crystals.
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Single and two photon time resolved polarised fluorescence studies of probe molecule dynamics in nematic liquid crystals.

机译：单一和两个光子时间分辨探针分子动力学的偏振荧光研究。

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We present the results of combined single and two photon linearly polarised time resolved fluorescence anisotropy measurements of the order and motion of a fluorescent probe (rhodamine 6G) in the nematic phase of 4-n-pentyl4'-cyanobiphenyl (5CB). Variation of the excitation polarisation angle (P) with respect to the nematic director yield a set of initial single and two photon anisotropies R(0,β). Single photon R(0,β) measurements yield the and moments of the ground state orientational distribution function. For rhodamine 6G in 5CB these indicate that the inclusion of higher moments ( and above) are necessary to describe the probe ordering within the nematic host.. Two photon R(0,β) measurements however allow the direct measurement of , for rhodamine 6G these yield a value close to theoretical predictions. Two and single photon initial anisotropy measurements are wholly consistent with an approximately Gaussian probe distribution at an angle of 38?to the nematic director with a full width half maximum of c.a. 26 ° Variation of (3 affords the photoselection of both cylindrically symmetric and asymmetric degrees of probe alignment that are sensitive respectively to θ andθ plus Φ diffusion in the laboratory (nematic director) frame. Cylindrically symmetric and asymmetric alignment relaxation are observed to be linear but with distinctly different relaxation rates, indicating highly restricted probe motion within the nematic environment.
机译：我们介绍组合单的单个光子线性偏振时间分辨荧光各向异性定位荧光各向异性测量的荧光探针（罗丹明6g）的荧光探针（Rhodamine 6g）的荧光各向异性的结果，在4-n-戊基4'-氰基溴脲（5cb）的向量中。激发偏振角（P）相对于列目透剂的变化产生一组初始单个和两个光子各向异性R（0，β）。单光子R（0，β）测量结果产生地位校正分布函数的和矩。对于5CB中的罗丹明6g，这些表明，必须包含更高的时刻（_6>及更高版本）来描述向列宿主内的探针排序。然而，两个光子R（0，β）测量，但允许直接测量，对于罗丹明6g这些产生了接近理论预测的值。两个和单个光子初始各向异性测量值完全一致地符合大致高斯探针分布，以38的角度为38？到目前文体导演，全宽半最大为C.a. （3提供圆柱形对称和不对称程度的光束的探针对准，分别敏感到实验室（向列示）框架中的θ和θ加φ扩散。观察到圆柱对称和不对称对准松弛是线性的，但是具有明显不同的松弛率，表明向列环境中的高度限制探针运动。

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