Pacheco-Peña Victor, Riley Joseph Arnold, Liu Cheng-Yang, Minin Oleg V, Minin Igor V
School of Mathematics, Statistics and Physics, Newcastle University, Newcastle Upon Tyne, NE1 7RU, UK.
School of Engineering, Newcastle University, Newcastle Upon Tyne, NE1 7RU, UK.
Sci Rep. 2021 Oct 13;11(1):20278. doi: 10.1038/s41598-021-99744-5.
Photonic hooks have demonstrated to be great candidates for multiple applications ranging from sensing up to optical trapping. In this work, we propose a mechanism to produce such bent structured light beams by exploiting the diffraction and scattering generated by a pair of dielectric rectangles immersed in free space. It is shown how the photonic hooks are generated away from the output surface of the dielectrics by correctly engineering each individual dielectric structure to generate minimum diffraction and maximum scattering along the propagation axis. Different scenarios are studied such as dual-dielectric structures having different lateral dimensions and refractive index as well as cases when both dielectrics have the same lateral dimensions. The results are evaluated both numerically and theoretically demonstrating an excellent agreement between them. These results may open new avenues for optical trapping, focusing and sensing devices via compact and simple dual-dielectric structures.
光子钩已被证明是从传感到光学捕获等多种应用的理想候选者。在这项工作中，我们提出了一种机制，通过利用沉浸在自由空间中的一对介电矩形产生的衍射和散射来产生这种弯曲的结构化光束。展示了如何通过正确设计每个单独的介电结构，使其在传播轴上产生最小的衍射和最大的散射，从而在远离电介质输出表面的地方产生光子钩。研究了不同的情况，例如具有不同横向尺寸和折射率的双介电结构，以及两种电介质具有相同横向尺寸的情况。通过数值和理论评估结果，证明了它们之间具有极好的一致性。这些结果可能会通过紧凑且简单的双介电结构为光学捕获、聚焦和传感设备开辟新途径。
