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首页> 外文期刊>Bulletin of the American Physical Society >APS -APS March Meeting 2017 - Event - Double gyroid photonic crystal: synthesis and mid-infrared photonic characterization
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APS -APS March Meeting 2017 - Event - Double gyroid photonic crystal: synthesis and mid-infrared photonic characterization

机译：APS -APS 2017年3月会议-活动-双陀螺光子晶体：合成和中红外光子表征

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摘要

Gyroids are triply symmetric and have surfaces containing no straight lines. Single gyroid (SG) photonic crystals have a large band gap, while double gyroids (DG) with P-breaking symmetry possess Weyl points and topologically non-trivial surface states. These topologically protected states give rise to backscattering immune unidirectional transport. We have synthesized and characterized the first mid-IR gyroid photonic crystals, including both SGs and DGs with Weyl points. Polymer gyroid scaffold was written by DLW, followed by ALD of Al$_{mathrm{2}}$O$_{mathrm{3}}$, polymer removal and conformally coating of a-Si. The resulting DGs have Weyl points at 8 $mu$ m and k between 0.3-0.5$pi $/a. Characterization of SG and DG have been performed by angle resolved mid-IR spectroscopy. The photonic bandstructure is constructed from angle resolved reflectance and transmittance spectra, all the way close to the light line. Constructed bandstructures from SGs exhibit a photonic bandgap. For DGs the bandstructures reveal defect photonic states emerging inside the bandgap. Strategies to observe protected surface states in DGs will be discussed.
机译：陀螺仪是三重对称的，并且表面不包含直线。单旋翼（SG）光子晶体具有较大的带隙，而具有P断裂对称性的双旋翼（DG）具有Weyl点和拓扑上不重要的表面态。这些拓扑受保护的状态引起反向散射的免疫单向传输。我们已经合成并表征了第一批中红外回旋光子晶体，包括具有Weyl点的SG和DG。聚合物回旋骨架由DLW编写，随后是Al $ _ {mathrm {2}} $ O $ _ {mathrm {3}} $的ALD，聚合物去除和a-Si的保形涂层。生成的DG的Weyl点为8μm/ m，k为0.3-0.5pi / a。 SG和DG的表征已通过角度分辨中红外光谱进行。光子能带结构由角度分辨的反射光谱和透射光谱构成，一直到光线附近。从SGs构建的能带结构显示出光子带隙。对于DG，能带结构揭示了带隙内部出现的缺陷光子状态。将讨论观察DG中受保护表面状态的策略。

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