光学学报, 2020, 40 (24): 2413002, 网络出版: 2020-11-23
一维光子晶体槽型微环谐振器及其传感特性 下载: 1163次
One-Dimensional Photonic Crystal Groove Microring Resonators and its Sensing Characteristics
集成光学 微环谐振器 Fano共振 槽型波导 折射率传感器 integrated optics microring resonators Fano resonance groove waveguide refractive index sensor
摘要
为了使折射率传感器具有高品质因子和高灵敏度,提出一种基于槽型光波导的一维光子晶体微环谐振器。该结构中两种不同状态的光模式在不同的光路上相互干涉而产生Fano共振,这种非对称线型的结构能够获得更高的消光比和品质因子,在折射率传感方面也有更好的灵敏度。采用时域有限差分法对结构进行分析和模拟仿真。仿真结果表明,所提结构的品质因子达到30950,比传统微环谐振器提高4倍以上;消光比为29.08 dB,比传统微环谐振器高出16.89 dB。在折射率传感特性的分析中,所提结构的灵敏度达到344 nm/RIU,比传统微环谐振器提高3倍;灵敏度检测下限为1.4×10 -4 RIU。
Abstract
In order to make the refractive index sensor has high quality factor and high sensitivity, a one-dimensional photonic crystal microring resonator based on a grooved optical waveguide is proposed. In this structure, the light modes of two different states interfere with each other in different optical paths to produce in Fano resonance. This asymmetric linear structure can obtain higher extinction ratio and quality factor, and it also has better sensitivity in refractive index sensing. The structure is analyzed and simulated by using finite-difference time domain method. The simulation results show that the quality factor of the proposed structure reaches 30950, which is more than 4 times higher than the traditional microring resonator, and the extinction ratio is 29.08 dB, which is 16.89 dB higher than that of the traditional microring resonator. In the analysis of refractive index sensing characteristics, the sensitivity of the proposed structure reaches 344 nm/RIU, which is 3 times higher than of traditional microring resonators, and the lower limit of sensitivity detection is 1.4×10 -4 RIU.
刘春娟, 桑常林, 吴小所, 穆洲, 蔡佳丽, 贾文娟. 一维光子晶体槽型微环谐振器及其传感特性[J]. 光学学报, 2020, 40(24): 2413002. Chunjuan Liu, Changlin Sang, Xiaosuo Wu, Zhou Mu, Jiali Cai, Wenjuan Jia. One-Dimensional Photonic Crystal Groove Microring Resonators and its Sensing Characteristics[J]. Acta Optica Sinica, 2020, 40(24): 2413002.