双层局部非对称光栅的偏振无关宽带反射
Polarization-Independent Broadband Reflection with Two-Layer Locally Asymmetric Grating
投稿时间:2019-03-25  修订日期:2019-03-25
DOI:
中文关键词: 亚波长光栅  宽带反射器  泄漏模共振
英文关键词: Subwavelength grating  Broadband reflector  Leakage mode resonance
基金项目:国家自然科学(11504435),中南民族大学中央高校基本科研费项目(CZY18001),国家留学基金委项目(201807780001)
作者单位E-mail
侯金 中南民族大学 电子信息工程学院 houjin@mail.scuec.edu.cn 
杨滨贤 中南民族大学 电子信息工程学院  
杨春勇 中南民族大学 电子信息工程学院  
陈少平 中南民族大学 电子信息工程学院  
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中文摘要:
      为了满足光通信与传感系统发展对光反射器的偏振和带宽的性能要求,将局部非对称光栅与正交串联反射排布方式相结合,实现了具有超宽反射带宽的偏振无关反射。首先,基于局部非对称结构,在TM模式下使得光栅的四个泄露模式能够分布在更宽的光谱上,从而实现了反射率大于98%的宽达469纳米的单偏振超宽带反射。其次,利用正交串联排布方式90°的旋转对称性,设计形成双层光栅反射,在反射率大于97%时获得了492纳米的偏振无关宽带反射。最后,对串联光栅之间的间距进行了探讨,结果表明:非对称串联光栅不仅在大间距和特定的小间距下能够实现宽谱偏振无关的反射,考虑间距的改变,还可应用于光滤波器和光传感器等方面。
英文摘要:
      In order to meet the demands of both polarization and bandwidth performance of the reflectors in optical communication and sensing systems, polarization-independent reflection with ultra-wide bandwidth is obtained by combining local asymmetric grating with orthogonal series arrangement. Firstly, based on the local asymmetric structure, the four leakage modes of the grating could be distributed over a wide spectrum in TM mode, which makes the local asymmetric grating have an ultra-wideband reflection of 469 nm with reflectivity greater than 98%. Secondly, making use of the 90-degree rotational symmetry in orthogonal series arrangement, the polarization-independent broadband reflection of 492 nm with reflectivity greater than 97 % is obtained with an optimized bi-layer grating system. Finally, the spacing distance between the two series connection gratings are studied. It shows that asymmetric series gratings not only can achieve wide-spectrum polarization-independent reflection with both large spacing and specific small spacing distances, they also can be applied to optical filters and optical sensors when changing the spacing distances.
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