多重旋转对称结构光子晶格的实验研究  

Experimental Study of Multiple Rotational Symmetry Photonic Lattices

作　　者：武一洁[1] 杨立森[1] 王龙飞[1] 李强[1] 施慧渊[1] 

机构地区：[1]内蒙古师范大学物理与电子信息学院,内蒙古呼和浩特010022

出　　处：《激光与光电子学进展》2014年第3期161-166,共6页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(60467002);内蒙古自然科学基金(2013MS0926)

摘　　要：采用光诱导光子晶格的方法,利用3孔、4孔、5孔、8孔和12孔掩模在掺铁铌酸锂晶体中写入多重旋转对称结构的二维光子晶格。基于干涉理论,对多孔掩模干涉图样进行了数值模拟。通过实验成功地观测到了3孔、4孔、5孔、8孔和12孔布里渊区和远场衍射,并分析了布里渊区与远场衍射的对应关系,实验结果表明光子晶格图样和数值模拟一致。传统观测布里渊区的方法需要使用旋转漫反射器,观测布里渊区和写入晶格是不同的光路,而本方法只需在写入光路中加入衰减器便可观测到布里渊区,较之前的诸方法更为简单、稳定、易于调节。Utilizing the method of light-induced photonic lattices, we fabricate multiple rotational symmetry two-dimensional photonic lattices in LiNbOs：Fe crystal by masks with 3, 4, 5, 8 and 12 holes. Based on the interference principle, the multiple-beam interference pattern is obtained by numerical simulation. We observe the 3, 4, 5, 8 and 12 holes Brillouin-zone spectra and far-field diffraction patterns, and analyze the relationship between them. Experimental results are quite consistent with the simulation results. Traditional methods of observing Brillouin-zone spectra need rotating diffuser, using different optical paths to induce superlattices and observe Brillouin zone. We use attenuator only, so that the proposed method is simpler, more stable, and easier to adjust

关 键 词：非线性光学 光诱导光子晶格 布里渊区 LiNbO_3 Fe晶体 掩模 

分 类 号：O437[机械工程—光学工程]