Photonic crystal with 2-fold rotational symmetry for highly efficient asymmetric transmission
Photonic crystal with 2-fold rotational symmetry for highly efficient asymmetric transmission
复制标题
具有 2 重旋转对称性的光子晶体，可实现高效的非对称传输
DOI：
10.1016/j.optcom.2020.126346
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发表时间：
2020
影响因子：
2.4
通讯作者：
Xueting Han
中科院分区：
文献类型：
--
作者：
Fei Hongming;Yan Shuai;Wu Min;Han Lin;Yibiao Yang;Zhang Mingda;Xueting Han
摘要本文提出了一种基于自准直效应的具有二重旋转对称椭圆晶格的光子晶体异质结，实现了高效的光学非对称传输。前向透射的光可以沿着传播方向沿着准直并且有效地耦合出结构。因此，通过这种设计，在1550 nm的通信波长处，TE和TM偏振模的前向透射率可以达到0.661和0.581。2重旋转对称性允许通过调整椭圆的长轴与Γ -X方向之间的角度来进一步优化结构，并且发现当椭圆的长轴沿着Γ -X方向时可以实现高的前向透射率。
Abstract Here we demonstrate a photonic crystal heterostructure with 2-fold rotational symmetry elliptical shape lattice for highly efficient optical asymmetric transmission based on the self-collimation effect. The forward transmitted light can be collimated along the propagation direction and efficiently coupled out of the structure. Thus, the high forward transmittance up to 0.661 and 0.581 at the telecommunication wavelength of 1550nm for TE and TM polarized modes can be achieved by this design. The 2-fold rotational symmetry allows further optimizing the structure by tuning the angle between the major axis of the ellipse and the Γ -X direction, and found that high forward transmittance can be achieved when the major axis of the ellipse is along the Γ -X direction.