Xiang Yinxiao, Amarie Sergiu, Cai Wei, Luo Weiwei, Wu Wei, Ren Mengxin, Zhang Xinzheng, Xu Jingjun
Opt Express. 2019 Feb 18;27(4):5884-5892. doi: 10.1364/OE.27.005884.
By using transmission-mode, scattering-type scanning near-field optical microscopy, we characterize the mid-infrared near-field properties of a Yagi-Uda antenna in the emission mode. The underlying near-field properties, including the near-field dipole-dipole coupling between antenna elements, are clearly observed. Moreover, even though most of the radiation energy is emitted into the substrate, by adopting two detector antennas, we managed to verify the unidirectionality and frequency-selectivity of the Yagi-Uda antenna in the air side. All the experimental results presented in this work are in good qualitative agreement with our numerical simulations. Our work on the Yagi-Uda antenna could help lead to novel methods for mid-infrared material analysis and bio-sensing. It should also be applicable in all-optical processing like radiation routers or a chromatic discriminator.
通过使用透射模式的散射型扫描近场光学显微镜，我们表征了八木-宇田天线在发射模式下的中红外近场特性。天线元件之间潜在的近场特性，包括近场偶极-偶极耦合，都清晰可见。此外，尽管大部分辐射能量发射到了衬底中，但通过采用两个探测器天线，我们成功验证了八木-宇田天线在空气侧的单向性和频率选择性。这项工作中展示的所有实验结果与我们的数值模拟在定性上吻合良好。我们对八木-宇田天线的研究有助于开发用于中红外材料分析和生物传感的新方法。它也应该适用于诸如辐射路由器或色差鉴别器之类的全光处理。
