基于片式封装微纳光纤的布里渊散射特性研究

Research on Brillouin scattering characteristics based on chip-scale packaged micro-nano optical fibers

摘要:

为实现高灵敏度的温度传感测量，本文提出一种基于片式封装的微纳光纤温度传感结构。分析不同纤径微纳光纤的光场能量分布及其布里渊散射谱，并依据多种声学模式的特性、利用有限元仿真得到微纳光纤的不同声波模式下的温度灵敏度；对封装结构与材料进行设计与分析，选择片式结构及PMMA材料封装，仿真得到封装后的微纳光纤的温度灵敏度最高为4.83 MHz/℃，较未封装时灵敏度提高了约363%，证明片式封装可有效提升微纳光纤的温度灵敏度。

Abstract:

To achieve highly sensitive temperature sensing, this paper proposes a micro-nano optical fiber temperature sensing structure based on chip packaging. The optical field energy distribution of micro-nano optical fibers with different diameters and their Brillouin scattering spectrum are analyzed.?Based on the characteristics of various acoustic modes, the temperature sensitivity of micro-nano fibers under different acoustic wave modes are obtained by using finite element simulation. The packaging structure and materials are designed and analyzed, with a chip-scale structure and PMMA material chosen for packaging. The simulation shows that the maximum temperature sensitivity of packaged micro-nano fibers is 4.83 MHz/℃, which is an increase of about 363% compared to when unwrapped, demonstrating that chip packaging can effectively enhance the temperature sensitivity of micro-nano fibers.