C_(60)LB单分子膜的电光Pockels效应

Electrooptic Pockels Effect of a C 60 LB Monolayer

用电光调制衰减全反射光谱技术研究了Ｃ６０与花生酸混合的ＬＢ单分子膜的Ｐｏｃｋｅｌｓ（普克尔）效应。测量得到Ｃ６０ＬＢ膜的二阶非线性光学系数χ（２）（－ω；ω，０）＝０．５×１０－１２ｍ／Ｖ（１．３×１０－９ｅｓｕ）。这一结果与用光学二次产生测量Ｃ６０热蒸发膜的χ（２）（－２ω；ω，ω）同一数量级。并利用单分子层模型计算了Ｃ６０分子的超极化率为β＝１．１×１０－３０ｅｓｕ。

The second order nonlinearity of C 60 was deduced from the Pockels response of a mixed C 60 /AA LB monolayer by using electrooptically modulated attenuated total reflection spectroscopy. The obtained considerable second order susceptibility of C 60 χ (2) (-ω;ω,0) =0.5×10 -12 m/V(i.e. 1.3×10 -9 esu), in agreement with that obtained from the SHG measurement. And, the superpolarizability of C 60 , β =1.1×10 -30 esu, was calculated using a monolayer model.