Enhanced Evanescent Field Coupling of Smart Particles in Tubular Optical Microcavity for Sensing Application
Enhanced Evanescent Field Coupling of Smart Particles in Tubular Optical Microcavity for Sensing Application
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DOI：
10.1002/adom.202102158
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发表时间：
2021-12
影响因子：
9
通讯作者：
Shuo Yang;Yunqi Wang;Y. Kong;Gaoshan Huang;Zhe Zhao;Yang Wang;Borui Xu;J. Cui;Y. Mei
中科院分区：
文献类型：
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作者：
Shuo Yang;Yunqi Wang;Y. Kong;Gaoshan Huang;Zhe Zhao;Yang Wang;Borui Xu;J. Cui;Y. Mei
具有增强倏逝场的低语廊模式（WGM）光学微腔是研究光-物质相互作用最理想的系统之一。通过将智能粒子集成到微腔中，可以期待具有优异性能的独特传感器件和潜在应用，例如小模式体积和高灵敏度。本文证明了用钯纳米粒子（NPs）装饰的卷曲管状光学微腔能够感应氢（H2）。这种具有亚波长壁厚的微管表现出增强的传感性能，例如，由于倏逝场中的强耦合，检测限为1000ppm (ppm)，灵敏度为10−5 nm ppm−1。对实验和仿真结果进行了比较，指导了高品质参数的优化。该方法是一种将智能粒子与卷起的WGM微腔耦合用于气体传感的独特途径，在纳米光子学和智能传感器领域具有很大的应用潜力。
Whispering‐gallery mode (WGM) optical microcavity with enhanced evanescent field is one of the most perfect systems to study light–matter interaction. Unique sensing devices and potential applications with excellent performance can be expected by integrating smart particles into the microcavity, such as small mode volume and high sensitivity. Here, it is demonstrated that rolled‐up tubular optical microcavity decorated with palladium (Pd) nanoparticles (NPs) is capable for hydrogen (H2) sensing. Such microtube with subwavelength wall thickness exhibits enhanced sensing performance, e.g., detection limit of 1000 parts per million (ppm) and sensitivity in the order of 10−5 nm ppm−1, due to strong coupling in the evanescent field. Experiments and simulations are compared and guided the optimization for high figures of merit. The approach proves a unique route to couple smart particles with rolled‐up WGM microcavity for gas sensing, which have great application potentials in the field of nanophotonics and smart sensors.