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将4阶回音壁谐振模式(WGM)应用于折射率传感器的检测中。实验中以壁厚为4.8μm的微毛细管构建折射率传感器,验证了不同WGM的传感器灵敏度有显著差异。实验获得的最高灵敏度达到48.74nm/RIU(折射率单位),对应的探测极限达6.2×10-6 RIU。通过与模拟结果对比,清晰地识别出4阶WGM共振峰,并且4阶WGM在传感灵敏度方面有明显的优势。此外,分析了环境温度的扰动对不同径向阶数WGM共振波长的影响,发现与其他低阶模相比4阶WGM表现出低温度响应的优势。为实现实用的高灵敏度、抗热噪声折射率传感器提供了理论和实验基础。
4th-order echo wall resonance mode (WGM) is used in the detection of refractive index sensors. In the experiment, the refractive index sensor was constructed with microcapillary with a wall thickness of 4.8μm, which verified the significant difference of the sensor sensitivity of different WGMs. The maximum sensitivity obtained by experiment reached 48.74nm / RIU (refractive index unit), corresponding to the detection limit of 6.2 × 10-6 RIU. By contrasting with the simulation results, the 4th-order WGM formant is clearly identified, and the 4th-order WGM has obvious advantages in sensing sensitivity. In addition, the effects of ambient temperature disturbances on the WGM resonant wavelengths were analyzed. It was found that 4th order WGM exhibited the advantage of low temperature response compared with other low order modes. In order to achieve practical high sensitivity, thermal noise index sensor provides a theoretical and experimental basis.