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Variation of Topological Edge States of 2D Honeycomb Lattice Photonic Crystals
Physica Status Solidi-Rapid Research Letters ( IF 2.5 ) Pub Date : 2020-06-17 , DOI: 10.1002/pssr.202000202 Yuchen Peng 1 , Bei Yan 1 , Jianlan Xie 1 , Exian Liu 1 , Hang Li 1 , Rui Ge 1 , Feng Gao 1 , Jianjun Liu 1
Physica Status Solidi-Rapid Research Letters ( IF 2.5 ) Pub Date : 2020-06-17 , DOI: 10.1002/pssr.202000202 Yuchen Peng 1 , Bei Yan 1 , Jianlan Xie 1 , Exian Liu 1 , Hang Li 1 , Rui Ge 1 , Feng Gao 1 , Jianjun Liu 1
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Herein, the photonic quantum spin Hall effect is realized in a dielectric 2D honeycomb lattice photonic crystal (PC) with scatterers having various shapes, by stretching and shrinking the honeycomb unit cell. The topological edge states and their unidirectional transmission as scatterers with triangular, pentagonal, and heptagonal shapes are studied. The unidirectional transmission in an inverted Ω‐shaped waveguide, when different types of defects are incorporated, is realized to verify the characteristics of the topological protection. Moreover, flat band can be realized by varying the shape of several scatterers near the combined junction of PCs with different topological states, and the variation trend of flat band is evaluated with the increase in the edge number of varied scatterers from four to seven at different times. Moreover, a slow‐light waveguide is designed to further demonstrate the influence of the shape of scatterers on topological edge states for light transmission. Furthermore, the novel optical phenomenon of static state is realized; that is, light is not able to transmit but is trapped at the original position. This can increase the adjustability of the topological edge states and provide more potential applications for integrated photonic devices.
中文翻译：
二维蜂窝晶格光子晶体拓扑边缘态的变化
在此，通过拉伸和收缩蜂窝单元，在具有具有各种形状的散射体的电介质2D蜂窝晶格光子晶体（PC）中实现光子量子自旋霍尔效应。研究了三角形，五边形和七边形形状的散射体的拓扑边缘状态及其单向传输。当包含不同类型的缺陷时，可以实现反向Ω形波导中的单向传输，以验证拓扑保护的特性。此外，可以通过改变具有不同拓扑状态的PC组合结附近的多个散射体的形状来实现平坦带，并且随着不同散射体的边缘数从4增加到7，评估平坦带的变化趋势。次。此外，慢光波导旨在进一步证明散射体形状对光传输拓扑边缘状态的影响。此外，实现了新颖的静态光学现象。也就是说，光不能透射，但是会被捕获在原始位置。这可以增加拓扑边缘状态的可调整性，并为集成光子设备提供更多潜在的应用。
更新日期：2020-06-17
中文翻译：
二维蜂窝晶格光子晶体拓扑边缘态的变化
在此，通过拉伸和收缩蜂窝单元，在具有具有各种形状的散射体的电介质2D蜂窝晶格光子晶体（PC）中实现光子量子自旋霍尔效应。研究了三角形，五边形和七边形形状的散射体的拓扑边缘状态及其单向传输。当包含不同类型的缺陷时，可以实现反向Ω形波导中的单向传输，以验证拓扑保护的特性。此外，可以通过改变具有不同拓扑状态的PC组合结附近的多个散射体的形状来实现平坦带，并且随着不同散射体的边缘数从4增加到7，评估平坦带的变化趋势。次。此外，慢光波导旨在进一步证明散射体形状对光传输拓扑边缘状态的影响。此外，实现了新颖的静态光学现象。也就是说，光不能透射，但是会被捕获在原始位置。这可以增加拓扑边缘状态的可调整性，并为集成光子设备提供更多潜在的应用。
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