论文标题
观察红外电荷2光子Weyl点
Observation of a charge-2 photonic Weyl point in the infrared
论文作者
论文摘要
Weyl点是周期材料的带结构中稳健的点归化性，它们充当浆果曲率的单孔。他们一直在研究三维拓扑材料（无论是光子，电子还是其他）方面的研究，因为它们都与散装和表面上的新型行为相关联。在这里，我们介绍了通过两光子聚合制造的低折射率对比光子晶体中电荷2光子Weyl点的实验观察。通过傅立叶变换红外（FTIR）光谱获得的反射光谱与模拟匹配，并显示了两个带有二次散布的频带，围绕一个点变性。这项工作为全dielectric，低对比度的三维光子拓扑设备提供了一个发射点。
Weyl points are robust point degeneracies in the band structure of a periodic material, which act as monopoles of Berry curvature. They have been at the forefront of research in three-dimensional topological materials (whether photonic, electronic or otherwise) as they are associated with novel behavior both in the bulk and on the surface. Here, we present the experimental observation of a charge-2 photonic Weyl point in a low-index-contrast photonic crystal fabricated by two-photon polymerization. The reflection spectrum obtained via Fourier Transform Infrared (FTIR) spectroscopy closely matches simulations and shows two bands with quadratic dispersion around a point degeneracy. This work provides a launching point towards all-dielectric, low-contrast three-dimensional photonic topological devices.
