Omni-polarized Faraday isolator based on non-Hermitian Faraday system

Author:

Hu Hao1ORCID,Fu Xianhui,Qi Jiwei,Zhang Sihao,Wu QiangORCID,Lu YaoORCID,Chen Zongqiang,Chen Jing,Yu Xuanyi,Wang Xiaolei1,Sun Qian,Xu Jingjun

Affiliation:

1. Nankai University

Abstract

Non-Hermitian systems have recently attracted significant attention in photonics due to the realization that the interplay between gain and loss can lead to entirely new and unexpected features. Here, we propose and demonstrate a non-Hermitian Faraday system capable of non-reciprocal omni-polarizer action at the exceptional point. Notably, both forward and backward propagating light with arbitrary polarization converge to the same polarization state. Leveraging the robustness and non-reciprocity of the non-Hermitian Faraday system, we realize an omni-polarized Faraday isolator that can effectively isolate any polarized light without the need for a polarizer at the incident port of backward propagation. Remarkably, under the given parameter configuration, the isolator achieves a maximum isolation ratio of approximately 100 dB and a minimum isolation ratio of around 45 dB for various polarized light, accompanied by near-zero insertion loss. Furthermore, our research reveals the remarkable tolerance of the non-Hermitian Faraday isolator to nonlinear effects. This unique characteristic allows us to harness nonlinear effects to achieve various optical functions, all while maintaining excellent isolation performance. The proposed non-Hermitian Faraday system paves the way for the realization of magnetically or optically switchable non-reciprocal devices.

Funder

National Natural Science Foundation of China

China Postdoctoral Science Foundation

Natural Science Foundation of Tianjin Municipality

Science and Technology Commission of Tianjin Binhai New Area

111 Project

Program for Changjiang Scholars and Innovative Research Team in Nankai University

Fundamental Research Funds for the Central Universities

Publisher

Optica Publishing Group

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