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光学微球谐振腔由于其具有超高的Q值及极小的模式体积等优点,在高灵敏度传感和光通信等方面得到了广泛的研究。测试了未封装和封装后微球腔谐振波长随温度的变化,实验结果表明随温度增大,谐振波长线性红移,且线性度高。二者温度系数不同,未封装时为25.6 pm/℃,封装后为4.4 pm/℃,主要原因为紫外胶的负热光系数所致。理论分析了紫外胶的热光效应,通过控制紫外胶厚度可以改变光在紫外胶中的比例,从而调节温度系数。当光在紫外胶中比例为0.1135时,温度系数变为0,可以抑制温度漂移,实现了温度补偿;该比例继续增大,温度灵敏度提高。低温漂、高灵敏度、微型化拓宽了回音壁模式(WGM)传感器的应用潜力。
The optical microsphere resonator has been extensively studied in high sensitivity sensing and optical communication because of its high Q value and small mode volume. The variation of the resonant wavelength of the uncoated and encapsulated microsphere cavity with temperature was tested. The experimental results show that the linearly polarized resonant wavelength is redshifted with increasing temperature. The temperature coefficient of the two different, when not packaged 25.6 pm / ℃, packaged after 4.4 pm / ℃, mainly due to the negative thermal coefficient of UV glue. The thermo-optic effect of UV glue is analyzed theoretically. By controlling the thickness of UV glue, the ratio of light in UV glue can be changed so as to adjust the temperature coefficient. When the ratio of light in the UV glue is 0.1135, the temperature coefficient becomes 0, which can suppress temperature drift and achieve temperature compensation; the proportion continues to increase, and the temperature sensitivity increases. Low temperature drift, high sensitivity and miniaturization broaden the potential of echo-wall-mode (WGM) sensors.