Antiparity-Time Symmetry in Passive Nanophotonics
Antiparity-Time Symmetry in Passive Nanophotonics
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DOI：
10.1021/acsphotonics.0c01053
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发表时间：
2020-11-18
期刊：
影响因子：
7
通讯作者：
Huang, Yu-Ping
中科院分区：
文献类型：
--
作者：
Fan, Heng;Chen, Jiayang;Huang, Yu-Ping
在非厄米光学系统中，奇偶时间（PT）对称性保证了不同的光学效应和在保守光学中没有发现的应用。它的对应，反pt对称，订阅了另一类有趣的光学现象，并暗示了奇异光操纵的互补技术。尽管取得了令人兴奋的进展，但到目前为止，反pt对称性仅在体积庞大的系统或具有光学增益的系统中实现。在这里，我们报告了利用由三个倏逝耦合波导组成的全被动纳米光子平台在芯片上实现具有反pt对称的非厄米光学。通过在中心波导上沉积金属膜来引入强损耗，实现了一种抗pt系统。利用微加热器调节波导的折射率，观察到等功率分裂、同步调幅、相位控制耗散以及从反pt对称到破缺相位的转变等惊人行为。我们的研究结果突出了奇异的反厄米纳米光子学与同一芯片上的传统电路的整合，从而可以为量子光学研究和可扩展的信息处理创建有价值的芯片设备。
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.