Antiparity-Time Symmetry in Passive Nanophotonics,ACS Photonics

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Antiparity-Time Symmetry in Passive Nanophotonics
ACS Photonics ( IF 6.5 ) Pub Date : 2020-10-26 , DOI: 10.1021/acsphotonics.0c01053
Heng Fan _{1,

2} , Jiayang Chen _{1,

2} , Zitong Zhao _{1,

2} , Jianming Wen ₃ , Yu-Ping Huang _{1,

2}

Affiliation

Parity-time (PT) symmetry in non-Hermitian optical systems promises distinct optical effects and applications not found in conservative optics. Its counterpart, anti-PT symmetry, subscribes another class of intriguing optical phenomena and implies complementary techniques for exotic light manipulation. Despite exciting progress, so far, anti-PT symmetry has only been realized in bulky systems or with optical gain. Here, we report an on-chip realization of non-Hermitian optics with anti-PT symmetry by using a fully passive, nanophotonic platform consisting of three evanescently coupled waveguides. By depositing a metal film on the center waveguide to introduce strong loss, an anti-PT system is realized. Using microheaters to tune the waveguides’ refractive indices, striking behaviors are observed such as equal power splitting, synchronized amplitude modulation, phase-controlled dissipation, and transition from anti-PT symmetry to its broken phase. Our results highlight exotic anti-Hermitian nanophotonics to be consolidated with conventional circuits on the same chip, whereby valuable chip devices can be created for quantum optics studies and scalable information processing.

中文翻译：

被动纳米光子学中的反偶时对称性

非Hermitian光学系统中的奇偶时间（PT）对称性保证了独特的光学效果和在保守光学中找不到的应用。它的对应物，即反PT对称性，又吸引了另一类有趣的光学现象，并暗示了用于外来光操纵的互补技术。尽管取得了令人兴奋的进展，但迄今为止，仅在庞大的系统中或在具有光学增益的情况下才实现了抗PT对称性。在这里，我们报告通过使用由三个e逝耦合波导组成的完全无源纳米光子平台，实现具有反PT对称性的非Hermitian光学器件的片上实现。通过在中心波导上沉积金属膜以引入强损耗，可以实现抗PT系统。使用微加热器调整波导的折射率，观察到了惊人的行为，例如相等的功率分配，同步调幅，相位控制的耗散以及从反PT对称过渡到断相。我们的研究结果突出显示了将奇异的反赫尔米特纳米光子与常规电路整合在同一芯片上的优势，从而可以创建有价值的芯片设备用于量子光学研究和可扩展的信息处理。

更新日期：2020-11-18

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