空心微瓶腔回音壁模式谐振的调谐方法及应变传感特性  

Adjustment Method and Strain Sensing Characteristics of Whispering Gallery Mode Resonance in Hollow Microbottle

作　　者：蔡露 李尚文 王进 刘俊 相夫程 李忠嘉 Cai Lu;Li Shangwen;Wang Jin;Liu Jun;Xiang Fucheng;Li Zhongjia(College of Control Engineering,Northeastern University at Qinhuangdao,Qinhuangdao 066004,Hebei,China;College of Information Science and Engineering,Northeastern University,Shenyang 110819,Liaoning,China;Hebei Key Laboratory of Micro-Nano Precision Optical Sensing and Measurement Technology,Northeastern University at Qinhuangdao,Qinhuangdao 066004,Hebei,China)

机构地区：[1]东北大学秦皇岛分校控制工程学院,河北秦皇岛066004 [2]东北大学信息科学与工程学院,辽宁沈阳110819 [3]东北大学秦皇岛分校河北省微纳精密光学传感与检测技术重点实验室,河北秦皇岛066004

出　　处：《光学学报》2024年第2期213-220,共8页Acta Optica Sinica

基　　金：国家自然科学基金(61803076);河北省自然科学基金(F2022501028);教育部中央高校基本科研业务费(2023GFZD002)。

摘　　要：提出了一种双柄空心微瓶腔结构,利用微纳光纤耦合激发出了回音壁模式(WGM)谐振,通过控制轴向拉伸应变,实现了回音壁模式的谐振波长和品质因子Q的调谐,通过非对称拉锥的方式改变微腔结构,增大了双柄微腔结构轴向拉伸对腔长和壁厚的改变量,从而使谐振波长的调谐范围达到了0.66 nm。所提结构在激光器、滤波器和传感检测等应用方面具有实际意义。实验中进一步探究了非对称双柄回音壁模式微腔的应变传感特性,结果表明,WGM谐振峰对轴向拉伸应变的灵敏度可达0.795 pm/με,分辨率小于25με,线性度达0.999。由于回音壁模式谐振腔具有极窄的谐振峰,该传感方法能够实现更高的传感分辨率,为高分辨率应变传感提供了新思路。Objective The whispering gallery mode resonator(WGMR)has a very high quality factor and a very small mode volume,so it has great advantages in the fields of laser,optical communication,and biomedical detection.Because different applications may have different requirements for resonance peak parameters,scholars have proposed a series of resonance peak tuning methods.The tuning parameters include the wavelength of the resonance peak,Q value,coupling efficiency,etc.The resonant wavelength is directly related to the refractive index and size of the resonant cavity.In addition,the mechanical tuning method is the most simple and feasible method to control the WGM resonant wavelength in a wide range.In this paper,a double-handle hollow microbottle is proposed to achieve a simple and feasible wide-range tuning of WGM.The double-handle hollow microbottle is fabricated by using single-mode fiber,and the excited whispering gallery mode propagates in the thin wall of the hollow microbottle.By controlling the axial tensile strain,the diameter of the microcavity and the thickness of the microcavity wall can be adjusted,thereby realizing the tuning of the resonant wavelength and the quality factor Q of the whispering gallery mode.Methods First,the influence of controlling the temperature and stress on the resonant peak wavelength is analyzed theoretically.For the selected l-order WGM,if the environment temperature is changed,the relative variation of the resonant wavelength is determined by the effective refractive index and the microcavity radius.The stress regulation method is to apply an external force to the resonant cavity to deform the cavity,and the refractive index of the microcavity is affected by the photoelastic effect.The quality factor Q is related to the light field energy stored in the resonant cavity and the loss energy per cycle.When the microcavity is stretched,it will affect the radiation loss and coupling loss,thereby regulating the Q value.Second,in terms of the preparation of the structure,two sections of

关 键 词：集成光学 回音壁模式 空心微瓶腔 谐振峰调谐 应变传感 

分 类 号：TN253[电子电信—物理电子学]