Exceptional Point and toward Mode-Selective Optical Isolation,ACS Photonics

当前位置： X-MOL 学术 › ACS Photonics › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Exceptional Point and toward Mode-Selective Optical Isolation
ACS Photonics ( IF 6.5 ) Pub Date : 2020-03-13 , DOI: 10.1021/acsphotonics.9b01646
Arnab Laha _{1,

2} , Sibnath Dey ₁ , Harsh K. Gandhi ₁ , Abhijit Biswas ₂ , Somnath Ghosh ₁

Affiliation

Exceptional points (EPs) in non-Hermitian systems have recently attracted considerable attention owing to unique state-flipping and peculiar phase accumulation features. The dynamical encirclement of an EP and corresponding time-asymmetric mode evolution properties due to the breakdown in the adiabatic theorem have been a key to a range of exotic physical effects in various open atomic, molecular, and optical systems. Here, exploiting a new gain–loss-assisted dual-mode optical waveguide that hosts a dynamical EP-encirclement scheme, we have explored the enhanced nonreciprocal effect in the dynamics of light with the onset of saturable nonlinearity in the optical medium. We propose a prototype waveguide-based isolation scheme with the judicious tuning of nonlinearity level where one can pass only a chosen mode in any of the desired directions as per device requirement. The deliberate presence of EP enormously enhances the nonreciprocal transmission contrast even up to 40 dB over the proposed device length with a scope of further scalability. This exclusive topologically robust, mode-selective all-optical isolation scheme will certainly offer opportunities in integrated photonic circuits for efficient coupling operation from external sources and improve device performances.

中文翻译：

出色的点，并朝着模式选择光隔离的方向发展

非厄密系统中的异常点（EP）最近因其独特的状态翻转和独特的相位累积特性而引起了人们的极大关注。由于绝热定理的崩溃，EP的动态包围和相应的时间非对称模式演化特性已成为各种开放原子，分子和光学系统中一系列奇异物理效应的关键。在这里，我们利用一种具有动态EP包围方案的新型增益损耗辅助双模光波导，我们探索了光动力学中增强的不可逆效应，并在光学介质中出现了饱和非线性。我们提出了一种基于波导的原型隔离方案，该方案具有对非线性水平的明智调整，其中根据设备要求，只能在任何所需方向上通过选定的模式。EP的故意存在极大地增强了不可逆传输的对比度，甚至在建议的设备长度上达到了40 dB，并具有更大的可扩展性。这种专有的拓扑健壮的，模式选择性的全光隔离方案必将为集成光子电路提供机会，以实现来自外部源的有效耦合操作并改善器件性能。

更新日期：2020-04-23

点击分享查看原文

点击收藏

公开下载

阅读更多本刊最新论文本刊介绍/投稿指南11