光致异构聚合物材料中暗条纹的Y型分裂研究  

Y-splitting of dark stripe in photoisomerization polymers

作　　者：黎扬钢[1] 王晓生[1] 佘卫龙[1] 江德生[1] 

机构地区：[1]中山大学光电材料与技术国家重点实验室,广州510275

出　　处：《物理学报》2005年第12期5663-5670,共8页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:10374121);广东省自然科学基金(批准号:031567)资助的课题.~~

摘　　要：用数值分析方法研究了对称轴两侧光场具有相位跃变的暗条纹在具有光致异构非线性的聚合物中的演化情况及一些有关性质.结果表明,两侧光场相位跃变不为π时,入射暗条纹会向两边分开而形成Y型分裂;相位跃变从0到π增大,分裂程度变小.发现相位超前一边分出来的灰条纹与原传播方向之间的夹角对于不同相位跃变值基本保持不变,而相位滞后一边分出来的灰条纹与原传播方向之间的夹角则随相位跃变的增大而减小;相同相位跃变、不同光强的光束分开角度基本保持不变.数值模拟发现这种Y型分裂在材料中产生的折射率改变具有波导作用,可以使入射高斯光束产生Y型分裂.In photoisomerization polymer, the evolvement and some related properties of the dark stripe, in which the light field has a phase jump on both sides of the summetrical axis, are simulated by numerical method. The numerical results show that if the phase jump differs from π, the incident dark stripe will split into two grey stripes called Y-splitting, and the larger the phase jump （from 0 to π）, the smaller the Y-splitting. The numerical results also show that the angle between the phase-lead-branch and the direction of incidence is almost a constant for different phase jumps, while that of the phase-lag-branch varies with the phase jump. The angle between the two branches is unchanged under the condition of the same phase jump and different incident intensity. Besides, the numerical results also show that the refractive index change induced by Y-splitting in the material can act as a wave-guide, which leads an incident Gauss beam to form a Y-splitting.

关 键 词：光伏空间孤子 光致异构 Y型分裂 分步傅里叶法 

分 类 号：TB324[一般工业技术—材料科学与工程]