• Advanced Photonics
  • Vol. 1, Issue 4, 046002 (2019)
Da Xu1, Zi-Zhao Han1, Yu-Kun Lu1, Qihuang Gong1、2、3、4, Cheng-Wei Qiu5, Gang Chen3、6、**, and Yun-Feng Xiao1、2、3、4、*
Author Affiliations
  • 1Peking University, State Key Laboratory for Artificial Microstructures and Mesoscopic Physics, School of Physics, Beijing, China
  • 2Nano-optoelectronics Frontier Center of the Ministry of Education, Collaborative Innovation Center of Quantum Matter, Beijing, China
  • 3Shanxi University, Collaborative Innovation Center of Extreme Optics, Taiyuan, China
  • 4Beijing Academy of Quantum Information Sciences, Beijing, China
  • 5National University of Singapore, Department of Electrical and Computer Engineering, Singapore, Singapore
  • 6Shanxi University, Institute of Laser Spectroscopy, State Key Laboratory of Quantum Optics and Quantum Optics Devices, Taiyuan, China
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    Abstract

    Synchronization is of importance in both fundamental and applied physics, but its demonstration at the micro/nanoscale is mainly limited to low-frequency oscillations such as mechanical resonators. We report the synchronization of two coupled optical microresonators, in which the high-frequency resonances in the optical domain are aligned with reduced noise. It is found that two types of synchronization regimes emerge with either the first- or second-order transition, both presenting a process of spontaneous symmetry breaking. In the second-order regime, the synchronization happens with an invariant topological character number and a larger detuning than that of the first-order case. Furthermore, an unconventional hysteresis behavior is revealed for a time-dependent coupling strength, breaking the static limitation and the temporal reciprocity. The synchronization of optical microresonators offers great potential in reconfigurable simulations of many-body physics and scalable photonic devices on a chip.

    1 Introduction

    Synchronization phenomena are ubiquitously observed in nature, such as collective neuron bursts, stabilized heartbeats, and disciplined synchronous fireflies.13 Starting from the Huygens pendulum locked in antiphase,4,5 the synchronization of nonlinear oscillators has earned in-depth investigation.6 In daily life and modern industry, synchronization has been the basis for clock calibration, signal processing, and microwave communication,7 and provides schemes for clustered computing and memory storage.810 Over the past few years, the synchronization of mechanical resonators has been implemented, where the mechanical resonators are coupled strongly through direct conjunction elements,11,12 optical radiation fields,1317 or optical traveling waves,1821 facilitating mechanical-based high performance networks. Strong mutual coupling together with the nonlinearity of individually sustainable systems plays a crucial role in the realization of synchronization.2227

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    Da Xu, Zi-Zhao Han, Yu-Kun Lu, Qihuang Gong, Cheng-Wei Qiu, Gang Chen, Yun-Feng Xiao. Synchronization and temporal nonreciprocity of optical microresonators via spontaneous symmetry breaking[J]. Advanced Photonics, 2019, 1(4): 046002
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    Category: Research Articles
    Received: Apr. 15, 2019
    Accepted: Jul. 29, 2019
    Posted: Jul. 29, 2019
    Published Online: Aug. 23, 2019
    The Author Email: Chen Gang (chengang@sxu.edu.cn), Xiao Yun-Feng (yfxiao@pku.edu.cn)