Wang Xiangyang, Chen Huanyang, Liu Hui, Xu Lin, Sheng Chong, Zhu Shining
National Laboratory of Solid State Microstructures and School of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, Jiangsu 210093, China.
Institute of Electromagnetics and Acoustics and Department of Electronic Science, Xiamen University, Xiamen 361005, China.
Phys Rev Lett. 2017 Jul 21;119(3):033902. doi: 10.1103/PhysRevLett.119.033902. Epub 2017 Jul 18.
Transformation optics has been used to propose various novel optical devices. With the help of metamaterials, several intriguing designs, such as invisibility cloaks, have been implemented. However, as the basic units should be much smaller than the working wavelengths to achieve the effective material parameters, and the sizes of devices should be much larger than the wavelengths of illumination to work within the light-ray approximation, it is a big challenge to implement an experimental system that works simultaneously for both geometric optics and wave optics. In this Letter, by using a gradient-index microstructured optical waveguide, we realize a device of conformal transformation optics (CTO) and demonstrate its self-focusing property for geometry optics and the Talbot effect for wave optics. In addition, the Talbot effect in such a system has a potential application to transfer digital information without diffraction. Our findings demonstrate the photon controlling ability of CTO in a feasible experiment system.
变换光学已被用于提出各种新型光学器件。借助超材料，已经实现了一些引人入胜的设计，如隐形斗篷。然而，由于基本单元应比工作波长小得多以实现有效的材料参数，并且器件尺寸应比照明波长长得多以便在光线近似下工作，因此实现一个同时适用于几何光学和波动光学的实验系统是一项巨大挑战。在本信函中，通过使用梯度折射率微结构光波导，我们实现了一种共形变换光学（CTO）器件，并展示了其对几何光学的自聚焦特性以及对波动光学的塔尔博特效应。此外，这种系统中的塔尔博特效应在无衍射传输数字信息方面具有潜在应用。我们的研究结果在一个可行的实验系统中证明了CTO的光子控制能力。
