摘要
实验研究了盐ＬａｎｇｍｕｉｒＢｌｏｄｇｅｔ单分子层膜在不同基频光和倍频光偏振态组合（ｓ→ｐ，ｐ→ｐ和４５°→ｓ）情况下的透射光学二次谐波产生（ＳＨＧ），并利用有关透射方向ＳＨＧ理论公式进行了曲线拟合．结果发现，随着入射角的增大，拟合曲线与实验点存在较大的偏移．这是因为忽略了基频光和倍频光在作为ＬＢ膜衬底的玻璃基板内的多次反射造成的．研究了理论拟合曲线和实验结果偏移的主要原因．并给出了考虑多次反射最低阶修正后的理论公式和拟合曲线．研究结果表明：进行变入射角情况下的透射ＳＨＧ研究时，特别是当测量涉及到ｓ偏振态时，如果要固定探测装置的位置不变。
Abstract Transmitted second harmonic generation (SHG) study was made on Stilbazium salt Langmuir Blodgett monolayer with different polarization combinations (s→p,p→p and 45°→s). The experimental data fitted in well with the transmitted SHG theoretical expressions. And when the angle of incidence increased the theoretical data deviated from the experiments. This phenomenon may be due to the neglecting of the multiple reflection of fundamental light and harmonic light in the glass substrate on which LB monolayers were deposited. We also investigated the reasons for such deviation and gave a corrected explanation. It is found that multiple reflection in glass substrate should be considered when transmitted SHG was made with s polarization and fixing detectors were used.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
1997年第1期78-86,共9页
Acta Physica Sinica
基金
国家自然科学基金
国家高技术研究发展计划资助
