| Birefringence Grating and Surface Grating in Azobenzene Polymer Liquid Crystal Films Investigated by Near—Field Optical method |
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| 作者姓名： | 章江英 明海 王沛 孙晓红 鲁拥华 吴云霞 谢建平 张其锦 刘剑 谢爱芳 张泽渤 顾本源 |
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| 作者单位： | [1]DepartmentofPhysics,universityofScienceandTechnologyofchina,Hefei230026 [2]StructureResearchLaboratory,universityofScienceandTechnologyofchina,ChineseAcademyofSciences,Hefei230026;DepartmentofPolymerScienceandEngineering,universityofScienceandTechnologyofChina,Hefei230026 [3]LaboratoryofOpticalPhysics,InstituteofPhysics,ChineseAcademyofScineces,Beijing100080 |
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| 摘 要： | The birefringence grating and the surface grating in azobenzene polymer liquid-crystal (Azo-PLC) films are studied by a near-fied scanning optical microscope.With laser irradiation,the refractive index change caused by birefringence and the sinusoidal surface profile are observed at the near-field transmittance image and the surface topography of the grating.The grating period and the peak-to-peak value of the sinusoidal surface profile are 0.8μm and 40nm,respectively.The maximum diffractive efficiency of the grating is 2% .The dynamic process of the grating formation is probed and analysed.The mass diffusion responsible for the formation of the surface grating due to the temperature rise is analysed.
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| 关 键 词： | 偶氮苯聚合物液晶薄膜 近场扫描光学显微镜 双折射光栅 表面光栅 激光照射 |
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