Chip-scale Floquet topological insulators for 5G wireless systems
Chip-scale Floquet topological insulators for 5G wireless systems
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DOI：
10.1038/s41928-022-00751-9
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发表时间：
2022-05-02
影响因子：
34.3
通讯作者：
Krishnaswamy, Harish
中科院分区：
文献类型：
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作者：
Nagulu, Aravind;Ni, Xiang;Krishnaswamy, Harish
基于准静电螺旋面旋转元件的Floket拓扑电磁电路可用于5G相控阵应用和宽带脉冲雷达波束形成的芯片级天线接口。Floket拓扑绝缘体具有由时变哈密顿保持的奇异拓扑顺序，可用于无线通信、雷达和量子信息处理等一系列技术。然而，光子Floquet拓扑绝缘体的演示仅限于在空间维度上模拟时间的系统，这保留了时间反转对称性，从而去除了包括非互易拓扑保护在内的有价值的特征。在这里，我们报道了基于准静电波在开关电容网络中传播的光子Floquet拓扑绝缘体。该方法为电磁波提供了非互易的Floket拓扑绝缘体，并打开了高达千兆赫兹频率的大拓扑带隙。我们的设备利用时间调制来超越传统线性时不变电磁结构的延迟带宽限制，因此提供了很大的延迟，尽管带宽很宽。将Floquet拓扑绝缘体集成到一个互补的金属氧化物半导体(CMOS)芯片中，通过展示它可以用于多天线全双工无线操作和基于实时时延的宽带波束形成，展示了它在5G无线系统中的潜力。
Floquet topological electromagnetic circuits based on quasi-electrostatic helicoidally rotating elements can be used to create chip-scale antenna interfaces for 5G phased-array applications and wideband impulse radar beamforming.Floquet topological insulators, which have an exotic topological order sustained by time-varying Hamiltonians, could be of use in a range of technologies, including wireless communications, radar and quantum information processing. However, demonstrations of photonic Floquet topological insulators have been limited to systems that emulate time with a spatial dimension, which preserves time-reversal symmetry and thus removes valuable features including non-reciprocal topological protection. Here we report photonic Floquet topological insulators based on quasi-electrostatic wave propagation in switched-capacitor networks. The approach provides non-reciprocal Floquet topological insulators for electromagnetic waves and opens a large topological bandgap that spans up to gigahertz frequencies. Our devices exploit time modulation to operate beyond the delay-bandwidth limit of conventional linear time-invariant electromagnetic structures and therefore offer large delays, despite the broad bandwidth. The Floquet topological insulator is integrated into a complementary metal-oxide-semiconductor (CMOS) chip, and we illustrate its potential for 5G wireless systems by showing that it can be used for multi-antenna full-duplex wireless operation and true-time-delay-based broadband beamforming.