UV-polarizing linear polyyne molecules aligned in PVA
UV-polarizing linear polyyne molecules aligned in PVA
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PVA 中排列的紫外线偏振线性聚炔分子
DOI：
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发表时间：
2019
影响因子：
1
通讯作者：
T. Wakabayashia
中科院分区：
文献类型：
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作者：
R. Sata;H. Suzuki;Nami Ueno;Y. Morisawa;Miho Hatanaka;T. Wakabayashia
利用共轭直链碳分子H（C $equiv$ C）$_n$ H（$n$ =5-7）的电子吸收带设计了适用于紫外光的光偏振膜。激光烧蚀的聚炔在尺寸上分离并分散在聚乙烯醇（PVA）膜中，该膜被拉伸以使内部捕获的线性聚炔分子对齐。作为结构各向异性的一种性质，聚炔分子的紫外吸收的跃迁偶极子平行于分子轴，并且仅对于其电矢量的振幅沿着分子轴的电磁波发生吸收。聚炔分子在固体PVA膜中定向排列并固定，在特定波长下作为入射光的偏振分量之一的选择性吸收体。利用偏振方向可旋转的线偏振紫外光作为光源，研究了含有取向聚炔分子的拉伸PVA薄膜的吸收强度随角度的变化，并用线性二向色性理论中的序参量进行了分析。
Electronic absorption bands of conjugated linear carbon chain molecules, namely polyynes H(C $equiv$ C) $_n$ H ( $n$ =5-7), are exploited to devise light-polarizing films applicable to the UV. Laser ablated polyynes are separated in size and dispersed in a film of polyvinyl alcohol (PVA), which is stretched to align the trapped linear polyyne molecules inside. As a nature of the structural anisotropy, transition dipole of the UV absorption for polyyne molecules is in parallel with the molecular axis and the absorption occurs only for the electromagnetic wave having the amplitude of its electric vector along the molecular axis. Aligned and fixed orientationally in the solid PVA film, polyyne molecules act as selective absorbers of one of the polarization components of incident light at particular wavelength. Using a light source of linearly polarized UV light, whose direction of polarization is rotatable, angular dependence of the absorption intensity is investigated for the stretched PVA film containing aligned polyyne molecules and analyzed in terms of an order parameter in the theory of linear dichroism.