Asymmetric transmission of light waves in a photonic crystal waveguide heterostructure with complete bandgaps.
Asymmetric transmission of light waves in a photonic crystal waveguide heterostructure with complete bandgaps.
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DOI：
10.1364/ao.387331
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发表时间：
2020-05
期刊：
影响因子：
1.9
通讯作者：
Hongming Fei;Qi Zhang;Min Wu;Han Lin;Xin Liu;Yibiao Yang;Mingda Zhang;R. Guo;Xueting Han-Xueting
中科院分区：
文献类型：
--
作者：
Hongming Fei;Qi Zhang;Min Wu;Han Lin;Xin Liu;Yibiao Yang;Mingda Zhang;R. Guo;Xueting Han-Xueting
在这里，我们从理论上提出了一种基于光子晶体（PhC）波导结构的完全光子带隙（CPBG）的片上纳米光子非对称传输器件（ATD）。ATD包括具有CPBG的二维二氧化硅和锗PhCs，在其中引入线缺陷以创建高效波导以实现高前向透射率。同时，利用全内反射原理阻挡后向入射，实现非对称透射。我们通过扫描不同的结构参数，优化设计的光子晶体和波导结构。优化后的ATD在1582 nm波长处具有较高的TE模前向透过率和对比度，分别为0.581和0.989。研究结果加深了对ATD的认识，为设计新型ATD开辟了新的可能性.片上ATD将在光通信和量子计算中得到广泛的应用。
Here, we theoretically present an on-chip nanophotonic asymmetric transmission device (ATD) based on the photonic crystal (PhC) waveguide structure with complete photonic bandgaps (CPBGs). The ATD comprises two-dimensional silica and germanium PhCs with CPBGs, within which line defects are introduced to create highly efficient waveguides to achieve high forward transmittance. In the meantime, the total internal reflection principle is applied to block the backward incidence, achieving asymmetric transmission. We optimize the design of the PhCs and the waveguide structure by scanning different structure parameters. The optimized ATD shows a high forward transmittance of 0.581 and contrast ratio of 0.989 at the wavelength of 1582 nm for TE mode. The results deepen the understanding and open up the new possibility in designing novel ATDs. The on-chip ATD will find broad applications in optical communications and quantum computing.