Miniaturized Backward Coupler Realized by the Circuit-Based Planar Hyperbolic Waveguide
Miniaturized Backward Coupler Realized by the Circuit-Based Planar Hyperbolic Waveguide
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基于电路的平面双曲波导实现小型化反向耦合器
DOI：
10.1002/adpr.202100035
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发表时间：
2021-08-01
期刊：
影响因子：
--
通讯作者：
Chen, Hong
中科院分区：
文献类型：
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作者：
Guo, Zhiwei;Song, Juan;Chen, Hong
平面波导限制电磁波在特定方向上的传输，在滤波器、传感器和能量传输器件中有广泛的应用。然而，由于对平面集成光子学的需求不断增加，需要具有优异特性的新波导，例如更多功能，更高效率和更小尺寸。本文报道了用基于电路的磁性双曲超材料（HMM）制作平面微波波导的实验结果。隐马尔可夫模型（HMM）是一种特殊类型的各向异性超材料，其等效轮廓线（IFC）的形式是一个开放的双曲面。由于开放色散的IFC，Hulf支持传播具有大有效折射率的高k模式，这使得平面双曲波导能够小型化。特别地，与传统的介质平板波导相反，双曲波导中的群速度和相速度在相反的方向上取向，这一特性被用来实现电磁波的反向传播。利用这一特性，设计了一种基于双曲波导的后向耦合器，并进行了实验研究。在这里，基于电路的平台的实验研究的传播和耦合的导模的显着潜力不仅被揭示，而且还促进了使用HALF的许多集成功能器件。
Planar waveguides limit the transmission of electromagnetic waves in a specific direction and have a wide range of applications in filters, sensors, and energy-transfer devices. However, given the increasing demand for planar-integrated photonics, new waveguides are required with excellent characteristics such as more functionality, greater efficiency, and smaller size. Herein, the experimental results for a planar microwave-regime waveguide fabricated from circuit-based magnetic hyperbolic metamaterial (HMM) are reported. HMM is a special type of anisotropic metamaterial, whose isofrequency contour (IFC) takes the form of an open hyperboloid. Because of the open-dispersion IFCs, HMMs support propagating high-k modes with large effective refractive indices, which allow planar hyperbolic waveguides to be miniaturized. Especially, as opposed to the traditional dielectric slab waveguide, the group velocity and phase velocity in hyperbolic waveguides are oriented in opposite directions-a characteristic that is exploited to realize the backward propagation of electromagnetic waves. Based on this property, a backward coupler based on the hyperbolic waveguide is designed and experimented with. Herein, the significant potential of circuit-based platforms for the experimental study of the propagation and coupling of guided modes is not only revealed but also the use of HMMs for numerous integrated functional devices is promoted.