Second-harmonic generation in thin films of copper phthalocyanine.
Second-harmonic generation in thin films of copper phthalocyanine.
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铜酞菁薄膜中的二次谐波产生。
DOI：
10.1103/physrevb.48.14488
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发表时间：
1993
期刊：
影响因子：
--
通讯作者：
Ushioda
中科院分区：
文献类型：
--
作者：
Kumagai;Mizutani;Tsukioka;Yamauchi;Ushioda
我们观察到了厚度为40~2000K的铜酞菁多晶薄膜的光学二次谐波产生，该薄膜的非线性极化率为χZYY(2)=1.89×(3/4π)×10-7esu，其中Z和Y分别为垂直于薄膜表面和平行于薄膜表面的方向。这个值出人意料地大，接近著名的非线性光学晶体LiNbO_3的值的四分之一。非线性极化率的有限值表明该薄膜的结构缺乏反转对称性。二次谐波(SH)光的偏振特性表明薄膜缺乏垂直于薄膜表面的反转对称
We have observed the optical second-harmonic generation (SHG) from a polycrystalline film of copper phthalocyanine (CuPc) with thicknesses between 40 and 2000 K. The nonlinear susceptibility of this film is χ ZYY (2) =1.89×(3/4π)×10 -7 esu where Z and Y are the directions perpendicular and parallel to the film surface, respectively. This value is unexpectedly large, approaching a quarter of the value for the well-known nonlinear optical crystal LiNbO 3 . The finite value of the nonlinear susceptibility indicates that the structure of this film lacks inversion symmetry. The polarisation properties of the second-harmonic (SH) light show that the film lacks inversion symmetry perpendicular to the film surface