拓扑太赫兹片上山谷-自旋转换器

IF 4.6 Q1 OPTICS
Yudong Ren, Xinrui Li, Ning Han, Li Zhang, Rui Zhao, Qiaolu Chen, Yuze Hu, Mingyu Tong, Song Han, Yihao Yang
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引用次数: 0

摘要

拓扑光子学为下一代纳米光子芯片提供了一个功能强大的平台,充分利用了拓扑绝缘体对无序和缺陷的卓越适应能力。在二维(2D)光子拓扑绝缘体中,谷-霍尔(VH)和伪自旋-霍尔(PSH)拓扑绝缘体已成为最实用的设计,因为它们不需要打破时间反向对称性。这些光子拓扑绝缘体支持稳健的边缘状态,在从片上通信到光计算和传感等广泛应用中展现出巨大潜力。然而,在太赫兹(THz)波段,不同拓扑相(VH 和 PSH)之间的转换尚未实现。在此,我们通过实验展示了一种太赫兹片上自旋谷转换器,它是在二维参数空间中通过绝热演化实现的,无需关闭体带隙。通过利用绝热相变,我们证实了谷-自旋-谷转换器中两个谷态之间的高效转换。此外,我们还验证了太赫兹 PSH 拓扑能量传输通过急转弯角的稳健性。我们的发现不仅推进了对光子学中拓扑相的理解,而且为开发性能和功能更强的创新光子器件带来了希望。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Topological THz on-chip valley–spin converter
Topological photonics offers a powerful platform for next-generation nanophotonic chips, capitalizing on their remarkable resilience to disorder and defects. Among the two-dimensional (2D) photonic topological insulators, valley-Hall (VH) and pseudo-spin-Hall (PSH) topological insulators have emerged as the most practical designs, as they do not require breaking time-reversal symmetry. These photonic topological insulators support robust edge states, demonstrating promising potential for a wide range of applications, from on-chip communication to optical computing and sensing. However, the conversion between distinct topological phases (VH and PSH) in terahertz (THz) band has not been achieved. Here we experimentally demonstrate a THz on-chip spin–valley converter through adiabatic evolution in 2D parameter space without closing the bulk bandgap. By leveraging the adiabatic phase transition, we confirm the high-efficiency conversion between two valley states in a valley–spin–valley converter. In addition, we verify the robustness of THz PSH topological energy transport through sharply twisted corners. Our findings not only advance the understanding of topological phases in photonics but also hold promise for the development of innovative photonic devices with enhanced performance and functionality.
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来源期刊
CiteScore
10.70
自引率
0.00%
发文量
27
审稿时长
12 weeks
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