Efficient optical isolator via dual-Raman process with chiral nonlinearity

Mingzhi Han; Yuan He; Qianzhu Li; Xiaoyun Song; Yudou Wang; Aihong Yang; Qingtian Zeng; Yandong Peng

Results in Physics (Mar 2023)

Efficient optical isolator via dual-Raman process with chiral nonlinearity

Mingzhi Han,
Yuan He,
Qianzhu Li,
Xiaoyun Song,
Yudou Wang,
Aihong Yang,
Qingtian Zeng,
Yandong Peng

Affiliations

Mingzhi Han: Qingdao Key Laboratory of Terahertz Technology, College of Electronic and Information Engineering and College of Electrical Engineering and Automation, Shandong University of Science and Technology, Qingdao 266590, China
Yuan He: Qingdao Key Laboratory of Terahertz Technology, College of Electronic and Information Engineering and College of Electrical Engineering and Automation, Shandong University of Science and Technology, Qingdao 266590, China
Qianzhu Li: Qingdao Key Laboratory of Terahertz Technology, College of Electronic and Information Engineering and College of Electrical Engineering and Automation, Shandong University of Science and Technology, Qingdao 266590, China
Xiaoyun Song: Qingdao Key Laboratory of Terahertz Technology, College of Electronic and Information Engineering and College of Electrical Engineering and Automation, Shandong University of Science and Technology, Qingdao 266590, China
Yudou Wang: College of Science, China University of Petroleum, Qingdao 266580, China
Aihong Yang: Qingdao Key Laboratory of Terahertz Technology, College of Electronic and Information Engineering and College of Electrical Engineering and Automation, Shandong University of Science and Technology, Qingdao 266590, China
Qingtian Zeng: Qingdao Key Laboratory of Terahertz Technology, College of Electronic and Information Engineering and College of Electrical Engineering and Automation, Shandong University of Science and Technology, Qingdao 266590, China
Yandong Peng: Qingdao Key Laboratory of Terahertz Technology, College of Electronic and Information Engineering and College of Electrical Engineering and Automation, Shandong University of Science and Technology, Qingdao 266590, China; Corresponding author.

Journal volume & issue: Vol. 46
p. 106288

Abstract

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A scheme for optical nonreciprocity is proposed via dual-mode Raman process in thermal atoms. We investigate a far-detuned nonlinear Raman process, with the assistance of the Doppler effect to achieve chiral optical nonlinearity. The resulting Kerr nonlinear absorption is subject to a direction-dependent Doppler shifts seen by the thermal atoms. Moreover, the inter-channel Raman interference could significantly enhance Kerr nonlinear absorption for probe field, leading to the enhancement of the optical nonreciprocity. Simulation results show that the isolation ratio could reach 41 dB and the insertion loss is about 0.16 dB, with bandwidth up to 2π ×48 MHz. Furthermore, the sensitivity of the system is investigated under different strengths of the control and Raman fields.

Published in Results in Physics

ISSN: 2211-3797 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Science: Physics
Website: http://www.journals.elsevier.com/results-in-physics/

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