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Variation of Two-Photon Absorption Cross Sections and Optical Limiting of Compounds Induced by Static Electric Field
Yu-jin Zhang,Yu-zhi Song,Chuan-kui Wang?
Author NameAffiliationE-mail
Yu-jin Zhang College of Physics and Electronics, Shandong Normal University, Jinan 250014, China  
Yu-zhi Song College of Physics and Electronics, Shandong Normal University, Jinan 250014, China  
Chuan-kui Wang? College of Physics and Electronics, Shandong Normal University, Jinan 250014, China ckwang@sdnu.edu.cn 
Abstract:
By numerically solving the Maxwell-Bloch equations using an iterative predictor-corrector finite-difference time-domain technique, we investigate propagating properties of a few-cycle laser pulse in a 4,4′-bis(di-n-butylamino) stilbene (BDBAS) molecular medium when a static electric field exists. Dynamical two-photon absorption (TPA) cross sections are obtained and optical limiting (OL) behavior is displayed. The results show that when the static electric field intensity increases, the dynamical TPA cross section is enhanced and the OL behavior is improved. Moreover, both even- and odd-order harmonic spectral components are generated with existence of the static electric field because it breaks the inversion symmetry of the BDBAS molecule. This work provides a method to modulate the nonlinear optical properties of the BDBAS compounds.
Key words:  Static electric field, Optical limiting, Two-photon absorption, Organic molecule
FundProject:
静电场诱导的分子双光子吸收截面和光限幅性能的变化
张玉瑾,宋玉志,王传奎*
摘要:
采用时域有限差分法数值求解麦克斯韦-布洛赫方程,研究了当存在静电场时少周期脉冲激光在4,4'-二(二正丁胺基)二苯乙烯(BDBAS)分子介质中的传播过程,得到了分子的动态双光子吸收(TPA)截面并且展示了其光限幅行为. 由于静电场的存在打破了BDBAS分子的对称性,因此激光在传播过程中,其频谱同时出现了偶次谐波和奇次谐波. 随着静电场强度的增加,分子的动态TPA截面增大,同时光限幅效应更为明显.
关键词:  静电场,光限幅,双光子吸收,有机分子
DOI:10.1063/1674-0068/27/03/259-264
分类号: