Liao Yu-Yang, Chen Yung-Tsan, Chen Chien-Chun, Huang Jian-Jang
Graduate Institute of Photonics and Optoelectronics, National Taiwan University, Taipei 1kin6, Taiwan.
Materials (Basel). 2018 Apr 3;11(4):549. doi: 10.3390/ma11040549.
The sensitivity of traditional diffraction grating sensors is limited by the spatial resolution of the measurement setup. Thus, a large space is required to improve sensor performance. Here, we demonstrate a compact hexagonal photonic crystal (PhC) optical sensor with high sensitivity. PhCs are able to diffract optical beams to various angles in azimuthal space. The critical wavelength that satisfies the phase matching or becomes evanescent was used to benchmark the refractive index of a target analyte applied on a PhC sensor. Using a glucose solution as an example, our sensor demonstrated very high sensitivity and a low limit of detection. This shows that the diffraction mechanism of hexagonal photonic crystals can be used for sensors when compact size is a concern.
传统衍射光栅传感器的灵敏度受测量装置空间分辨率的限制。因此，需要较大空间来提高传感器性能。在此，我们展示了一种具有高灵敏度的紧凑型六边形光子晶体（PhC）光学传感器。光子晶体能够将光束衍射到方位空间的各个角度。满足相位匹配或变为倏逝波的临界波长被用于标定施加在光子晶体传感器上的目标分析物的折射率。以葡萄糖溶液为例，我们的传感器展现出非常高的灵敏度和低检测限。这表明当关注紧凑尺寸时，六边形光子晶体的衍射机制可用于传感器。
