不同表压下芪盐单层LB膜二次谐波的研究

在不同表压下制备芪盐的单层LB薄膜,测量LB膜的二次谐波信号.在低表压得到增强的二次谐波信号.对比芪盐的透射光谱,认为在LB膜中,芪盐以固相态存在,低表压时的固相态聚集体的吸收峰351nm使四阶非线性极化率x(4)(-2ω;ω,ω,ω,-ω)产生共振增强,四阶光学非线性现象对二次谐波信号产生影响.

STUDY OF SECOND-HARMONIC GENERATION(SHG) FOR STILBAZIUM SALT LANGMUIR-BLODGETT MONOLAYER FILM AT THE DIFFERENT SURFACE PRESSURE

Second-harmonic generation(SHG) of stilbazium salt Langmuir-Blodgett monolayer film in the different surface pressure was measured. We got the incremental SHG signal at the low surface pressure. After the transparent spectra of stilbazium salt were measured, we got the following results. The stilbazium salt on LB film was in the form of solid state. The absorption peak 351 nm of the aggregation of solid state at the low surface pressure led to that the fourth order nonlinear optical susceptibility X(4)(-2ω;ω,ω,ω,-ω) was enhanced resonantly. Because of X(4), we got the incremental SHG signal.