| Orientation-Enhanced Photorefractive Effect in PVK-PBA：DR1：TNF Polymer |
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| 引用本文： | 李潞瑛,赵有源,李富铭,杨剑,陈国荣,汪长春.Orientation-Enhanced Photorefractive Effect in PVK-PBA：DR1：TNF Polymer[J].中国物理快报,2004,21(8):1535-1538. |
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| 作者姓名： | 李潞瑛 赵有源 李富铭 杨剑 陈国荣 汪长春 |
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| 作者单位： | [1]StateKeyLaboratoryforAdvancedPhotonicMaterialsandDevices,DepartmentofOpticalScienceandEngineering,FudanUniversity,Shanghai200433 [2]DepartmentofMaterialScienceandEngineering,FudanUniversity,Shanghai200433 [3]DepartmentofMacromoleculeScience,FudanUniversity,Shanghai200433 |
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| 摘 要： | We developed a novel photorefractive (PR) polymer PVK-PBA:DR1:TNF, and its film sample was prepared with outstanding performance by using the method of combination of vacuum saturated vapour resolving with vacuum hot-pressing. The sample exhibits distinctive PR properties with the two-beam coupling coefficient up to 140cm^-1 and four-wave mixing (FWM) diffraction efficiency above 1.5% in the absence of applied external electric field. The designed experiments, including measurements of the second-order nonlinear coefficient and birefringence as well as the relationship between the diffraction efficiencies of the FWM and the external bias field, were performed to understand the underlying mechanism, because this phenomenon cannot be explained by the conventional PR theories. It is presented that because of its high orientational mobility and large dipole moment, the polymer produces the photovoltaic effect under the irradiation of laser to induce a space-charge field so as to engender the PR effect under zero or low external fields. A model based on the assumption was established and the simulation agrees well with the experimental results.
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| 关 键 词： | 光折射聚合物 光子器件 PVK-PBA：DR1：TNF聚合物 四波混合衍射效率 薄膜物理 |
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