Experimental study of the second-order non-linear optical properties of tetrathia-[7]-helicene
Experimental study of the second-order non-linear optical properties of tetrathia-[7]-helicene
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DOI：
10.1016/s0009-2614(03)00437-8
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发表时间：
2003-04-29
影响因子：
2.8
通讯作者：
Weber, V
中科院分区：
文献类型：
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作者：
Clays, K;Wostyn, K;Weber, V
作为调幅频率函数的飞秒超瑞利散射（HRS）实验已经在四硫-[7]-螺旋烯上进行。由于双光子荧光 (2PF) 的贡献，表观第一超极化率 beta(app)(omega) 是频率 omega 增加的递减函数。然而，我们还首次观察到频率相关的 HRS 去极化比 rho(omega)。 rho 的准确值很重要，因为它提供了发色团对称性的指示（偶极子、八极子为 5，分别为 1.5，但也与频率无关，因为 HRS 和 2PF 相同）。对于螺旋对称性，p(omega) 随着频率的升高而增加，这与理论一致。 (C) 2003 Elsevier Science B.V. 保留所有权利。
Femtosecond hyper-Rayleigh scattering (HRS) experiments as a function of amplitude modulation frequency have been performed on tetrathia-[7]-helicene. The apparent first hyperpolarizability beta(app)(omega) is a decreasing function of increasing frequency omega, due to the two-photon fluorescence (2PF) contribution. We observe, however, for the first time, also a frequency-dependent HRS depolarization ratio rho(omega). An accurate value for rho is important, since it offers an indication for the symmetry of the chromophore (5, resp. 1.5, for dipoles, resp. octopoles, but also independent of frequency, since identical for HRS and 2PF). For helicoidal symmetry p(omega) is increasing for higher frequencies, in agreement with theory. (C) 2003 Elsevier Science B.V. All rights reserved.