Demonstration of mid-infrared slow light one-dimensional photonic crystal ring resonator with high-order photonic bandgap

光子晶体 材料科学 慢光 谐振器 光学 光电子学 红外线的 带隙 光子学 吸收(声学) 波导管 物理
作者
Fujun Sun,Bowei Dong,Jingxuan Wei,Yiming Ma,Huiping Tian,Chengkuo Lee
出处
期刊:Optics Express [Optica Publishing Group]
卷期号:28 (21): 30736-30736 被引量:20
标识
DOI:10.1364/oe.392677
摘要

Integrated mid-infrared sensing offers opportunities for the compact, selective, label-free and non-invasive detection of the absorption fingerprints of many chemical compounds, which is of great scientific and technological importance. To achieve high sensitivity, the key is to boost the interaction between light and analytes. So far, approaches like leveraging the slow light effect, increasing optical path length and enhancing the electric field confinement (f) in the analyte are envisaged. Here, we experimentally investigate a slow light one-dimensional photonic crystal ring resonator operating at high-order photonic bandgap (PBG) in mid-infrared range, which features both strong field confinement in analyte and slow light effect. And the optical path length can also be improved by the resoantor compared with waveguide structure. The characteristics of the first- and second-order bandgap edges are studied by changing the number of patterned periodical holes while keeping other parameters unchanged to confine the bands in the measurement range of our setup between 3.64 and 4.0 µm. Temperature sensitivity of different modes is also experimentally studied, which helps to understand the field confinement. Compared to the fundamental PBG edge modes, the second PBG edge modes show a higher field confinement in the analyte and a comparable group index, leading to larger light-matter interaction. Our work could be used for the design of ultra-sensitive integrated mid-infrared sensors, which have widespread applications including environment monitoring, biosensing and chemical analysis.
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