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arXiv 1402.0355physics.optics
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用于高分辨率传感应用的准液滴微泡

Quasi-droplet Microbubbles for High Resolution Sensing Applications

Yong Yang, Jonathan Ward, Síle Nic Chormaic

摘要:

采用有限元法对熔融石英微泡的光学特性和传感性能进行了数值研究。模式特性,如品质因数(Q)和有效折射率,被确定为不同的气泡直径和壳厚度。对于具有回音壁模式(WGM)的感测应用,较薄的壳产生改进的灵敏度。然而,Q因子随着厚度减小而减小,这限制了最终分辨率。三种类型的传感应用与微气泡,基于其优化的几何参数,进行了研究。在这里,所谓的准液滴制度的定义和讨论。结果表明,最好的分辨率时,微泡作为准液滴,即使是在电信C波段的水填充腔。

英文摘要:

Optical properties and sensing capabilities of fused silica microbubbles were studied numerically using a finite element method. Mode characteristics, such as quality factor (Q) and effective refractive index, were determined for different bubble diameters and shell thicknesses. For sensing applications with whispering gallery modes (WGMs), thinner shells yield improved sensitivity. However, the Q-factor decreases with reduced thickness and this limits the final resolution. Three types of sensing applications with microbubbles, based on their optimized geometrical parameters, were studied. Herein the so-called quasi-droplet regime is defined and discussed. It is shown that best resolution can be achieved when microbubbles act as quasi-droplets, even for water-filled cavities at the telecommunications C-band.

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