Here, a slow light-based refractive index sensor has been presented in a hole-type 2D hexagonal lattice photonic crystal waveguide by insertion of only four defect holes inside the channel. The width of the channel has been optimized to provide single mode operation and large free spectral range. Also, the performance of the sensor with and without introducing the central cavity inside the channel have been regarded for different radii of defects. The proposed sensor presents the highest sensitivity and detection range of 126 nm/RIU and 1–2.2, respectively for the detection based on band edge shift. The defects inside the channel have been introduced to obtain high Q-factor by defect radii tailoring. The highest average Q-factor and sensitivity of 1570 and 249.5 have been obtained for defect hole with radius of r_c=0.34a. The study has been carried out by plane wave expansion and finite difference time domain analysis. There is a good agreement between the results and the study proves the effect of slow light on the enhancement of light-matter interaction and sensitivity. The proposed structures can find potential applications in gas or liquid detection in medical and biochemical fields.

在这里，通过在通道内仅插入四个缺陷孔，在孔型 2D 六方晶格光子晶体波导中呈现了一种基于慢光的折射率传感器。通道的宽度已经过优化，以提供单模操作和大的自由光谱范围。此外，针对不同的缺陷半径，考虑了在通道内部引入和不引入中心腔的传感器的性能。所提出的传感器具有最高的灵敏度和检测范围，分别为 126 nm/RIU 和 1-2.2，用于基于带边缘偏移的检测。通道内的缺陷已被引入，以通过缺陷半径裁剪获得高 Q 因子。半径为 r _{c 的}缺陷孔的平均 Q 值和灵敏度最高，分别为 1570 和 249.5=0.34a。该研究已通过平面波展开和有限差分时域分析进行。结果之间有很好的一致性，研究证明了慢光对增强光-物质相互作用和灵敏度的影响。所提出的结构可以在医学和生化领域的气体或液体检测中找到潜在的应用。