Author Affiliations
Abstract
1 北京大学物理学院人工微结构和介观物理国家重点实验室, 北京 100871
2 中国科学院物理研究所, 北京 100190
Due to their high quality factors and small mode volumes, whispering gallery mode (WGM) microcavities can strongly enhance light-matter interactions, making them an excellent platform for various sensing applications. In this paper we review the burgeoning field of microcavity sensing. We first present recent state-of-the-art results, and discuss microcavity sensing platforms and mechanisms. We then review a variety of WGM sensing applications, including the sensing of single nanoparticles, temperatures, magnetic fields, chemical gases, and strain/stress. Furthermore, we provide a brief summary and outlook on microcavity-based sensing devices and their potential applications.
回音壁模式光学微腔 微腔传感 单纳米颗粒检测 生物传感 磁场传感 whispering-gallery microcavity microcavity sensing single nanoparticle detection biosensing magnetometry Journal of Semiconductors
2019, 48(3):
浙江大学 信息与电子工程学院 微电子与光电子研究所, 杭州 310027
设计了一种可以探测单个纳米粒子的光学传感器结构, 该结构由双环、双环间耦合区的通孔和直波导构成, 并引入了Fano效应, 进一步增强了粒子在光场中出现时的光耦合场变化.当纳米粒子穿过两个微环间的通孔时, 其耦合系数和输出端的光强均发生变化, 提出了一种基于双环谐振器结构的高精度耦合系数传感方法, 通过检测双环谐振器耦合系数和输出端光强的变化对单体纳米粒子进行精确检测和计数.理论计算结果表明, 在损耗为1dB/cm的情况下, 与单环结构相比, 双环结构的灵敏度提升了两个数量级.该双环结构在减小波导损耗的同时有效提升了检测灵敏度.
光电子器件 光子传感器 微环谐振器 耦合系数 纳米粒子检测 Optoelectronic device Photonic sensor Microring resonator Coupling coefficient Nanoparticle detection
