| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Intrinsic polarization conversion and avoided-mode crossing in X-cut lithium niobate microrings |
| Zelin Tan(谭泽林)1,2, Jianfa Zhang(张检发)1,2, Zhihong Zhu(朱志宏)1,2, Wei Chen(陈伟)3, Zhengzheng Shao(邵铮铮)4,†, Ken Liu(刘肯)1,2,‡, and Shiqiao Qin(秦石乔)1,2,§ |
1 College of Advanced Interdisciplinary Studies & Hunan Provincial Key Laboratory of Novel Nano Optoelectronic Information Materials and Devices, National University of Defense Technology, Changsha 410073, China;
2 Nanhu Laser Laboratory, National University of Defense Technology, Changsha 410073, China;
3 College of Meteorology and Oceanography, National University of Defense Technology, Changsha 410073, China;
4 School of Physics, Central South University, Changsha 410083, China |
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Abstract Compared with well-developed free space polarization converters, polarization conversion between TE and TM modes in the waveguide is generally considered to be caused by shape birefringence, like curvature, morphology of waveguide cross section and scattering. Here, we study the polarization conversion mechanism in 1-THz-FSR X-cut lithium niobate microrings with multiple-resonance condition, that is the conversion can be implemented by birefringence of waveguides, which will also introduce an avoided-mode crossing. In the experiment, we find that this mode crossing results in severe suppression of one sideband in local nondegenerate four-wave mixing and disrupts the cascaded four-wave mixing on this side. Simultaneously, we propose one two-dimensional method to simulate the eigenmodes (TE and TM) in X-cut microrings, and the mode crossing point. This work will provide one approach to the design of polarization converters and simulation for monolithic photonics integrated circuits, and may be helpful to the studies of missed temporal dissipative soliton formation in X-cut lithium niobate rings.
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Received: 24 April 2024
Revised: 30 April 2024
Accepted manuscript online: 06 May 2024
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PACS:
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42.81.Gs
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(Birefringence, polarization)
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52.35.Mw
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(Nonlinear phenomena: waves, wave propagation, and other interactions (including parametric effects, mode coupling, ponderomotive effects, etc.))
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42.82.-m
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(Integrated optics)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 12274462 and 11674396), the Department of Science and Technology of Hunan Province of China (Grant Nos. 2017RS3039 and 2018JJ1033), and the Hunan Provincial Innovation Foundation for Postgraduate of China (Grant No. QL20210006). |
Corresponding Authors:
Zhengzheng Shao, Ken Liu, Shiqiao Qin
E-mail: zzshao_nudt@163.com;liukener@163.com;sqqin8@nudt.edu.cn
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Cite this article:
Zelin Tan(谭泽林), Jianfa Zhang(张检发), Zhihong Zhu(朱志宏), Wei Chen(陈伟), Zhengzheng Shao(邵铮铮), Ken Liu(刘肯), and Shiqiao Qin(秦石乔) Intrinsic polarization conversion and avoided-mode crossing in X-cut lithium niobate microrings 2024 Chin. Phys. B 33 064205
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