外壁涂覆介质层的微泡谐振腔热响应特性数值模拟分析
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摘要
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.
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.
引文
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[2]Yuan G,Zhang M L,Gong C Y,et al.Sensitive optofluidic flow rate sensor based on laser heating and microring resonator[J].Microfluidics&Nanofluidics,2015,19(6):1497-1505.
[3]Zhi Y,Meldrum A.Tuning a microsphere whispering-gallery-mode sensor for extreme thermal stability[J].Applied Physics Letters,2014,105(3):2721.
[4]Ward J M,Yang Y,Chormaic S N.Liquid core microbubble resonators for highly sensitive temperature sensing[C]∥SPIE LASE,International Society for Optics and Photonics,2014:271-283.
[5]Lu Q J,Liao J,Liu S,et al.Precise measurement of micro bubble resonator thickness by internal aerostatic pressure sensing[J].Optics Express,2016,24(18):20855.
[6]Tang T,Wu X,Liu L Y,et al.Packaged optofluidic microbubble resonators for optical sensing[J].Applied Optics,2016,55(2):395.
[7]Ma Q L,Rossmann T,Guo Z X.Whispering gallery mode silica microsensors for cryogenic to room temperature measurement[J].Measurement Science&Technology,2010,21(2):25310-25317.
[8]Ward J M,Yang Y,Chormaic S N.Highly sensitive temperature measurements with liquid-core microbubble resonators[J].IEEE Photonics Technology Letters,2013,25(23):2350-2353.
[9]Socorro A B,Soltani S,Villar I D,et al.Temperature sensor based on a hybrid ITO-silica resonant cavity[J].Optics Express,2015,23(3):1930-1937.
[10]Rose B A,Maker A J,Armani A M.Characterization of thermooptic coefficient and material loss of high refractive index silica sol-gel films in the visible and near-IR[J].Optical Materials Express,2012,2(5):671-681.
[11]Li H,Guo Y B,Sun Y Z,et al.Analysis of single nanoparticle detection by using 3-dimensionally confined optofluidic ring resonators[J].Optics Express,2010,18(24):25081.
[12]李明.高Q回音壁模式微泡光学谐振腔的光学特性研究[D].上海:复旦大学,2014.
[13]Lin N,Jiang L,Wang S M,et al.Thermostable refractive index sensors based on whispering gallery modes in a microsphere coated with poly(methyl methacrylate)[J].Applied Optics,2011,50(7):992.
[14]董永超.回音壁模式微腔的耦合特性与封装技术研究[D].合肥:中国科学技术大学,2016.
[15]Oxborrow M.Traceable 2D finite-element simulation of the Whispering-Gallery modes of axisymmetric electromagnetic resonators[J].IEEE Transactions on Microwave Theory&Techniques,2007,55(6):1209-1218.