Institute of Atomic Physics and Spectroscopy, University of Latvia, Jelgavas Str. 3, LV-1004 Riga, Latvia.
Sensors (Basel). 2021 Oct 29;21(21):7184. doi: 10.3390/s21217184.
Among the different types of photonic sensor devices, optical whispering gallery mode resonators (WGMRs) have attracted interest due to their high level of sensitivity, small size, and ability to perform real-time temperature measurements. Here we demonstrate the applicability of temperature measurements using WGMR in both air and liquid environments. We also show that WGMR allowed measurements of the refractive index variations in an evaporating glucose-water solution droplet. The thermal tuning of WGMR can be reduced by coating WGMRs with a thin layer of polymethyl methacrylate (PMMA). Dip-coating the silica microsphere multiple times significantly reduced the resonance shift, partially compensating for the positive thermo-optical coefficient of silica. The shift direction changed the sign eventually.
在不同类型的光子传感器设备中，光学 whispering gallery 模式谐振器（WGMR）因其高灵敏度、小尺寸和能够实时进行温度测量而引起了人们的兴趣。在这里，我们展示了在空气和液体环境中使用 WGMR 进行温度测量的适用性。我们还表明，WGMR 允许测量蒸发葡萄糖水溶液液滴中的折射率变化。通过在 WGMR 上涂覆一层薄的聚甲基丙烯酸甲酯（PMMA），可以减少 WGMR 的热调谐。多次浸涂二氧化硅微球显著降低了共振位移，部分补偿了二氧化硅的正热光系数。最终，位移方向的符号发生了变化。
