基于非对称磁等离子体波导的非互易横向边缘自旋态的可调谐片上太赫兹隔离器,Laser & Photonics Reviews

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基于非对称磁等离子体波导的非互易横向边缘自旋态的可调谐片上太赫兹隔离器
Laser & Photonics Reviews ( IF 9.8 ) Pub Date : 2022-11-18 , DOI: 10.1002/lpor.202200509
Dan Zhao ₁ , Fei Fan _{1,

2} , Zhiyu Tan ₁ , Hao Wang ₁ , Shengjiang Chang ₂

Affiliation

太赫兹 (THz) 隔离器对于太赫兹应用系统中的单向传输至关重要。然而，实现具有集成结构和可调谐特性的太赫兹隔离器仍然具有挑战性。在此，展示了基于磁等离子体波导 (MPWG) 的太赫兹隔离器。在这个 InSb-空气-金属不对称波导中，等离子体带隙被表面等离子体激元激发和热调谐。此外，在弱外部磁场 (EMF) 下，磁等离子体激发非互易的横向边缘自旋态，这打破了 MPWG 的时间反转对称性，并导致一对仅允许单向传输的隔离带隙。宽带时域频谱系统和单频系统的实验结果均证实该隔离器可实现20 dB以上的隔离度和仅4 dB的插入损耗。

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Tunable On-Chip Terahertz Isolator Based on Nonreciprocal Transverse Edge Spin State of Asymmetric Magneto-Plasmonic Waveguide

Terahertz (THz) isolators are crucial to one-way transmission in THz application systems. However, it is still challenging to implement THz isolators with integrated structure and tunable characteristics. Herein, a THz isolator based on a magneto-plasmonic waveguide (MPWG) has been demonstrated. In this InSb-air-metal asymmetric waveguide, the plasmonic band gap is excited and thermally tuned by surface plasmons. Moreover, under weak external magnetic fields (EMFs), magneto-plasmons excite nonreciprocal transverse edge spin states, which break the time-reversal symmetry of the MPWG and lead to a pair of isolation bandgaps that only allow one-way transmission. The experimental results of both broadband time-domain spectrum system and single-frequency system confirm this isolator can achieve more than 20 dB isolation and only 4 dB insertion loss. More importantly, its isolation can be actively modulated by EMFs from 0 to 0.23 T, and also realize broadband tuning of over 1 THz frequency range by controlling the temperature from 80 to 280 K. This topological edge band structure of transverse spin states and its active manipulation mechanism are helpful to deepen the understanding of nonreciprocal plasmon propagation, and this broadband tunable THz on-chip isolator is significant to urgently apply in strong THz sources and ultra-sensitive detectors.

更新日期：2022-11-18

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