Harnessing sub-comb dynamics in a graphene-sensitized microresonator for gas detection

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外文摘要：Since their inception,frequency combs generated in microresonators,known as microcombs,have sparked significant scien-tific interests.Among the various applications leveraging microcombs,soliton microcombs are often preferred due to their inherent mode-locking capability.However,this choice introduces additional system complexity because an initialization process is required.Meanwhile,despite the theoretical understanding of the dynamics of other comb states,their practical potential,particularly in applications like sensing where simplicity is valued,remains largely untapped.Here,we demonstrate controllable generation of sub-combs that bypasses the need for accessing bistable regime.And in a graphene-sensitized microresonator,the sub-comb heterodynes produce stable,accurate microwave signals for high-precision gas detection.By exploring the formation dynamics of sub-combs,we achieved 2 MHz harmonic comb-to-comb beat notes with a signal-to-noise ratio(SNR)greater than 50 dB and phase noise as low as-82 dBc/Hz at 1 MHz offset.The graphene sensitization on the intracavity probes results in exceptional frequency responsiveness to the adsorption of gas molecules on the graphene of microcavity surface,enabling detect limits down to the parts per billion(ppb)level.This synergy between graphene and sub-comb formation dynamics in a microcavity structure showcases the feasibility of utilizing microcombs in an incoherent state prior to soliton locking.It may mark a significant step toward the development of easy-to-operate,systemically simple,compact,and high-performance photonic sensors.

外文关键词：

MicroresonatorOptical frequency combGrapheneGas sensing

作者：

Yupei Liang、Mingyu Liu、Fan Tang、Yanhong Guo、Hao Zhang、Shihan Liu、Yanping Yang、Guangming Zhao、Teng Tan、Baicheng Yao

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作者单位：

Key Laboratory of Optical Fiber Sensing and Communications(Ministry of Education),University of Electronic Science and Technology of China,Chengdu 611731,China

Institute of Semiconductors,Chinese Academy of Sciences,Beijing 100083,China

Engineering Center of Integrated Optoelectronic &Radio Meta-Chips,University of Electronic Science and Technology,Chengdu 611731,China

基金：

National Key Research and Development Program of ChinaNational Key Research and Development Program of ChinaNational Key Research and Development Program of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Postdoctoral Innovation Talent Support Program of ChinaIndustrial Key Project of China Southern Power Grid

项目编号：

2023YFB28056002021YFB28006022023YFB2806200U213010662305050BX20220056CG2100022001608777

出版年：

2024

DOI：

10.1007/s12200-024-00115-5

光电子前沿(英文版)

CSTPCDEI

影响因子：0.049

ISSN：2095-2759

年,卷(期)：2024.17(2)