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Time-asymmetric loop around an exceptional point over the full optical communications band

机译：在整个光通信频段上，围绕非凡点的时间非对称环路

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摘要

Topological operations around exceptional points(1-8)-time-varying system configurations associated with non-Hermitian singularities-have been proposed as a robust approach to achieving far-reaching open-system dynamics, as demonstrated in highly dissipative microwave transmission(3) and cryogenic optomechanical oscillator(4) experiments. In stark contrast to conventional systems based on closed-system Hermitian dynamics, environmental interferences at exceptional points are dynamically engaged with their internal coupling properties to create rotational stimuli in fictitious-parameter domains, resulting in chiral systems that exhibit various anomalous physical phenomena(9-16). To achieve new wave properties and concomitant device architectures to control them, realizations of such systems in application-abundant technological areas, including communications and signal processing systems, are the next step. However, it is currently unclear whether non-Hermitian interaction schemes can be configured in robust technological platforms for further device engineering. Here we experimentally demonstrate a robust silicon photonic structure with photonic modes that transmit through time-asymmetric loops around an exceptional point in the optical domain. The proposed structure consists of two coupled silicon-channel waveguides and a slab-waveguide leakage-radiation sink that precisely control the required non-Hermitian Hamiltonian experienced by the photonic modes. The fabricated devices generate time-asymmetric light transmission over an extremely broad spectral band covering the entire optical telecommunications window (wavelengths between 1.26 and 1.675 micrometres). Thus, we take a step towards broadband on-chip optical devices based on non-Hermitian topological dynamics by using a semiconductor platform with controllable optoelectronic properties, and towards several potential practical applications, such as on-chip optical isolators and non-reciprocal mode converters. Our results further suggest the technological relevance of non-Hermitian wave dynamics in various other branches of physics, such as acoustics, condensed-matter physics and quantum mechanics.
机译：已经提出了围绕异常点（1-8）的拓扑操作-与非Hermitian奇异性相关的时变系统配置-作为实现深远的开放系统动力学的可靠方法，已在高度耗散的微波传输中得到了证明（3）和低温光机振荡器（4）实验。与基于封闭系统Hermitian动力学的常规系统形成鲜明对比的是，异常点处的环境干扰与其内部耦合特性动态地相互作用，从而在虚拟参数域中产生旋转刺激，从而导致手性系统表现出各种异常的物理现象（9- 16）。为了获得新的波特性和随之而来的设备架构来控制它们，下一步是在应用丰富的技术领域中实现此类系统，包括通信和信号处理系统。但是，目前尚不清楚是否可以在健壮的技术平台中配置非Hermitian交互方案，以用于进一步的设备工程。在这里，我们通过实验演示了一种坚固的硅光子结构，该结构具有光子模式，该光子模式通过围绕光域中一个特殊点的时间不对称环路进行传输。所提出的结构由两个耦合的硅通道波导和一个平板波导泄漏辐射阱组成，它们可以精确控制所需的非光子哈密顿哈密顿光子模式。所制造的器件在覆盖整个光通信窗口（波长在1.26和1.675微米之间）的极宽光谱带上产生时间非对称光传输。因此，我们通过使用具有可控光电特性的半导体平台，朝着基于非Hermitian拓扑动力学的宽带片上光学器件迈出了一步，并迈向了一些潜在的实际应用，例如片上光学隔离器和非互易模式转换器。我们的结果进一步表明，非赫米特波动力学在物理学的其他各个分支中的技术相关性，例如声学，凝聚态物理学和量子力学。

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  • 来源
    《Nature》 |2018年第7725期|86-90|共5页
  • 作者

    Yoon Jae Woong; Choi Youngsun; Hahn Choloong; Kim Gunpyo; Song Seok Ho; Yang Ki-Yeon; Lee Jeong Yub; Kim Yongsung; Lee Chang Seung; Shin Jai Kwang; Lee Hong-Seok; Berini Pierre;

  • 作者单位

    Hanyang Univ, Dept Phys, Seoul, South Korea;

    Hanyang Univ, Dept Phys, Seoul, South Korea;

    Univ Ottawa, Sch Elect Engn & Comp Sci, Ottawa, ON, Canada;

    Hanyang Univ, Dept Phys, Seoul, South Korea;

    Hanyang Univ, Dept Phys, Seoul, South Korea;

    Samsung Elect Co Ltd, Samsung Adv Inst Technol, Suwon, South Korea;

    Samsung Elect Co Ltd, Samsung Adv Inst Technol, Suwon, South Korea;

    Samsung Elect Co Ltd, Samsung Adv Inst Technol, Suwon, South Korea;

    Samsung Elect Co Ltd, Samsung Adv Inst Technol, Suwon, South Korea;

    Samsung Elect Co Ltd, Samsung Adv Inst Technol, Suwon, South Korea;

    Samsung Elect Co Ltd, Samsung Adv Inst Technol, Suwon, South Korea;

    Univ Ottawa, Sch Elect Engn & Comp Sci, Ottawa, ON, Canada;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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