基于次级梳的石墨烯功能化微球气体传感  

Sub-comb based gas sensing in a graphene functionalized microsphere

作　　者：梁渝佩 刘铭宇 郭晏宏 张浩 常冰 安宁 谭腾 姚佰承[1] Yupei Liang;Mingyu Liu;Yanhong Guo;Hao Zhang;Bing Chang;Ning An;Teng Tan;Baicheng Yao(Key Laboratory of Optical Fiber Sensing and Communications(Education Ministry of China),University of Electronic Science and Technology of China,Chengdu 611731,China)

机构地区：[1]电子科技大学光纤传感与通信教育部重点实验室,成都611731

出　　处：《科学通报》2024年第12期1565-1571,共7页Chinese Science Bulletin

基　　金：国家重点研发计划(2021YFB2800602);中国博士后创新人才支持计划(BX20220056);中国博士后科学基金面上项目(2022M720668)资助。

摘　　要：光学微腔具有高品质因子和微小体积,为光学传感提供了理想平台.受限于微腔材料惰性和光源性能,基于光学微腔的高灵敏气体传感器的实现仍然是一个挑战.微腔光频梳具有等间距的频谱分量,被广泛用于大容量通信、高精密测量和光谱分析应用,已经成为通信和传感的新一代高性能光源.本文介绍了一种基于次级梳的石墨烯功能化微球气体传感器.相较于孤子态微梳,次级梳具有较高鲁棒性和更容易激发的特点,在气体传感方面展现出应用潜力.通过把次级梳的拍频作为传感探测信号,在石墨烯增敏作用下,实现了750 Hz/ppb的最大探测灵敏度和4 ppb的探测极限.该传感器保留了光频梳稳定性优势,同时避免了复杂的孤子激发和维持过程,为高性能实用化微型气体传感器的实现提供了新的技术路线.With high quality factor(Q)and compact size,the microcavity significantly enhances light-matter interactions,offering an ideal platform for biochemical sensing in photonics.So far,microcavity-based optical sensors have demonstrated advanced performance by utilizing mechanisms such as mode shifting,mode broadening,and mode splitting.More recently,the emergences of microlaser sensors and soliton microcomb sensors further provide new schemes for multispecies and ultrahigh resolution for gas detection.Among them,the microcomb-based sensing scheme offers high accuracy signals at coherent frequencies,illustrating unique advancements for tracing individual gas molecules in mixtures,however,it relies on the stability of the soliton excitation and maintaining,which determines the signal to noise ratio(SNR)in sensing operation.Such an acquisition of soliton states typically requires complex red detuning accessing,meanwhile the stability of soliton states needs strict control of environmental variables,which impairs the out-of-lab application of microcombs with high convenience and low cost.Besides,in gas sensing cases,due to the inertness of microcavity materials such as silica and silicon nitride,the absorption efficiency of gas molecules on microcavities is inhibited,limiting the sensitivity of gas detection.Here,a sub-comb based gas sensor in a graphene functionalized microsphere is demonstrated.Instead of using soliton states of a microcomb,we investigate sub-comb states,which appear in the blue-detuned region.Sub-comb is usually only regarded as an intermediate state in the soliton excitation process,although its theories and properties have been explored,it has never been applied to applications,to the best of our knowledge.In this work,the merge effect of sub-comb leveraged,providing frequency probe in the radio frequency domain for sensing,meanwhile,advantages owned by subcomb are excavated,endowing the system with preponderances over its soliton counterpart.On one hand,it resides in thermal-locked regime,demonstra

关 键 词：光频梳 石墨烯 微腔 气体传感 

分 类 号：TQ127.11[化学工程—无机化工] TP212[自动化与计算机技术—检测技术与自动化装置]