外壁涂覆介质层的微泡谐振腔热响应特性数值模拟分析

Numerical simulation analysis of thermal response characteristics of microbubble resonator with dielectric layer coating on outer wall

通过建立4层结构模型对涂覆介质层的微泡谐振腔进行热响应特性理论建模,研究了回音壁微泡腔外壁涂覆介质层时的热响应特性;利用有限元数值模拟的方法计算了涂覆介质层微泡腔的模式场分布和温度传感灵敏度。计算结果表明:具有氟化钙(CaF_2)涂覆层的微泡腔在径向一阶和径向二阶模式下能够有效降低温度升高引起的红移效应,而在径向三阶模式下,其温度灵敏度较传统的二氧化硅微泡腔提升了约55%,研究结果对进一步提升微泡腔的潜力具有重要意义。

Theory of thermal response characteristics of microbubble cavity coated with media is modeling by establishing a four-layer structure model,and thermal response characteristics of outer wall of microbubble cavity are discussed. Distribution of mode field and temperature sensitivity of media-coated microbubbles cavity is calculated numerically using finite element numerical simulation method. Computation results show that the microbubbles cavity with CaF_2 coated layer can effectively reduce the redshift effect caused by temperature increase in the first-order radial mode and the second-order radial modes,and in the third-order radial mode,its temperature sensitivity is about 55 % higher than that of the conventional SiO_2 microbubbles cavity. The research result has a great significance to further enhance sensing potential of microbubble cavity.