Electrooptic Properties of Submonolayer Polydiacetylene Nanoparticle Film Probed by Surface Plasmon Resonance Spectroscopy
Electrooptic Properties of Submonolayer Polydiacetylene Nanoparticle Film Probed by Surface Plasmon Resonance Spectroscopy
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DOI：
10.1143/jjap.51.032601
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发表时间：
2012-02
影响因子：
1.5
通讯作者：
D. Tanaka;Oki Kuraishi;K. Ozaki;K. Kajikawa
中科院分区：
文献类型：
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作者：
D. Tanaka;Oki Kuraishi;K. Ozaki;K. Kajikawa
采用表面等离子体共振条件下的衰减全反射几何结构，研究了表面覆盖率为 σ∼0.084 的金薄膜上的聚二乙炔 (PDA) 纳米粒子 (NP) 亚单层薄膜的电光 (EO) 特性。尽管在电偶极近似下 PDA NP 薄膜中不存在普克尔斯效应，但从 PDA NP 亚单层中观察到线性和二阶 EO 效应（普克尔斯效应和克尔效应）。 PDA NP 的二阶和三阶非线性磁化率分别确定为 χ(2) ∼102 pm/V 和 χ(3) ∼10-9 esu。磁化率与一般非线性光学材料的磁化率几乎一致。还讨论了 PDA NP 薄膜中普克尔斯效应的起源。
Electrooptic (EO) properties were studied for a polydiacetylene (PDA) nanoparticle (NP) submonolayer film on a thin gold film at a surface coverage of σ∼0.084, using the attenuated total reflection geometry at the surface plasmon resonance condition. Both linear and second-order EO effects (Pockels and Kerr effects) were observed from the PDA NP submonolayer, although the Pockels effect will be absent in the PDA NP film under the electric dipole approximation. The second- and third-order nonlinear susceptibilities of the PDA NPs are determined to be χ(2) ∼102 pm/V and χ(3) ∼10-9 esu, respectively. The susceptibilities are almost compatible with those in general nonlinear optical materials. The origin of the Pockels effect in the PDA NP film is also discussed.