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| 1 | Transformation optics applied to van der Waals interactions显示文摘The van der Waals force originates from the electromagnetic interaction between quantum fluctuationinduced charges. It is a ubiquitous but subtle force which plays an important role and has a wide range of applications in surface related phenomena like adhesion, friction,and colloidal stability. Calculating the van der Waals force between closely spaced metallic nanoparticles is very challenging due to the strong concentration of electromagnetic fields at the nanometric gap. Especially, at such a small length scale, the macroscopic description of the dielectric properties no longer suffices. The diffuse nonlocal nature of the induced surface electrons which are smeared out near the boundary has to be considered. Here,we review the recent progress on using three-dimensional transformation optics to study the van der Waals forces between closely spaced nanostructures. Through mapping a seemingly asymmetric system to a more symmetric counterpart, transformation optics enables us to look into the behavior of van der Waals forces at extreme length scales,where the effect of nonlocality is found to dramatically weaken the van der Waals interactions. | Rongkuo Zhao Yu Luo J.B.Pendry | 2016 | Science Bulletin2016，61，1： | 4 |
| 2 | Transformation optics from macroscopic to nanoscale regimes:a review显示文摘Transformation optics is a mathematical method that is based on the geometric interpretation of Maxwell’s equations.This technique enables a direct link between a desired electromagnetic(EM)phenomenon and the material response required for its occurrence,providing a powerful and intuitive design tool for the control of EM fields on all length scales.With the unprecedented design flexibility offered by transformation optics(TO),researchers have demonstrated a host of interesting devices,such as invisibility cloaks,field concentrators,and optical illusion devices.Recently,the applications of TO have been extended to the subwavelength scale to study surface plasmon-assisted phenomena,where a general strategy has been suggested to design and study analytically various plasmonic devices and investigate the associated phenomena,such as nonlocal effects,Casimir interactions,and compact dimensions.We review the basic concept of TO and its advances from macroscopic to the nanoscale regimes. | Jingjing Zhang John BPendry Yu Luo | 2019 | Advanced Photonics2019，1，1： | 4 |
| 3 | Theory, experiment and applications of metamaterials显示文摘In this review article, a brief introduction on the theory, experiments and applications of metamaterials is presented. The main focuses are concentrated on the composing meta-atoms, the method of transformation optics, the experimental demonstration of negative refraction, and the realizations of invisibility cloaks and electromagnetic black hole. At the end of this review, some typical applications of metamaterials, including high-performance antennas made of zero-refractive-index materials, inhomogeneous metamaterial lenses, and planar metasurfaces, are introduced in details. | TANG WenXuan MEI ZhongLei CUI TieJun | 2015 | Science China(Physics,Mechanics & Astronomy)2015，58，12： | 2 |
| 4 | 变换光学的物理原理和前沿进展显示文摘变换光学基于麦克斯韦方程的形式不变性,可以任意地控制电磁场达到需要的空间分布,是最近光学及电子工程领域的热门研究方向。从历史发展的角度回顾了变换光学概念的产生历程,简要介绍变换光学的基本物理原理,并结合光学隐身、光学幻觉和波导工程等现代光学工程试验总结了在当前科学和工程领域中的代表性应用。介绍近期变换光学新概念框架的进展以及在声学、热学、量子波领域中应用的拓展,讨论变换光学未来理论和工程方面的发展方向。 | 张永亮 董贤子 段宣明 赵震声 | 2014 | 量子电子学报2014，31，4： | 2 |
| 5 | Optical funnel:broadband and uniform compression of electromagnetic fields to an air neck显示文摘An optical funnel,which performs as a passive electromagnetic compressor,can guide electromagnetic waves from a wide inlet to a narrow outlet without reflectance/scattering and squeeze electromagnetic fields uniformly to an air neck.In this study,an optical funnel is designed by precisely filling subwavelength ceramic blocks with a gradient refractive index inside a tapered waveguide.The gradient refractive index is designed by transformation optics,which is isotropic and all above unit,thus exhibiting a broadband feature.Due to the mechanism of impedance matching over the whole funnel,extremely low reflectance/scattering and stable enhancement of fields can be achieved.The field enhancement factor in different regions of the funnel(e.g.,in the air neck)can be flexibly designed just by modifying the funnel-width ratios. | FEI SUN YICHAO LIU YIBIAO YANG | 2021 | Photonics Research2021，9，9： | 0 |
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