From Positive- to Negative-Index Materials: Transitional Phenomena

Transmission gap, Bragg-like reflection, and Goos-Hänchen shifts near the Dirac point inside a negative-zero-positive index metamaterial slab

Motivated by the realization of the Dirac point (DP) with a double-cone structure for optical field in the negative-zero-positive index metamaterial (NZPIM), the reflection, transmission, and Goos-Hänchen (GH) shifts inside the NZPIM slab are investigated. Due to the linear Dirac dispersion, the transmission as the function of the frequency has a gap, thus the correspond reflection has a frequency or wavelength window for the perfect reflection, which is similar to the Bragg reflection in the one-dimensional photonic crystals. Near the DP, the associated GH shifts in the transmission and refle…

使用混合近零折射率与高折射率超材料的极化转换

Polarization conversion using hybrid near-zero and high-index metamaterials

本文提出一种利用近零折射率与高折射率材料混合结构实现线偏振至圆偏振转换的策略，在平面几何中预测了反射与透射配置下的极化转换，并指出损耗限制性能，概念可从太赫兹拓展至光学域。

超材料与负折射率

Metamaterials and Negative Refractive Index

该研究综述超材料的最新进展，其人工构造特性可展现传统材料不具备的电磁特性（如人工磁性、负折射率），为实现新的奇异电磁现象提供可能。

关于Kerker现象的起源

On the origin of the Kerker phenomena

本文通过分析Kerker等人1983年报告的现象，揭示了阻抗匹配与折射率匹配条件与时空对称性的关系，并利用庞加莱群表示理论推导出电磁波在介质中的基本特性。

Non-magnetic nano-composites for optical and infrared negative refraction index media

We develop an approach to use nanostructured plasmonic materials as a non-magnetic negative-refractive index system at optical and near-infrared frequencies. In contrast to conventional negative refraction materials, our design does not require periodicity and thus is highly tolerant to fabrication defects. Moreover, since the proposed materials are intrinsically non-magnetic, their performance is not limited to proximity of a resonance so that the resulting structure has relatively low loss. We develop the analytical description of the relevant electromagnetic phenomena and justify our analyt…

利用接近零的epsilon现象实现芯片级光子调制

Leveraging Epsilon Near Zero phenomena for on-chip photonic modulation

本文研究了利用近零epsilon现象实现芯片级光子调制，通过控制材料载流子密度来调节量子发射体的辐射传输，揭示了材料损耗对性能的限制，并为设计近红外波段的光学调制器提供指导。

Nonlinear optical effects in artificial materials

We consider some nonlinear phenomena in metamaterials with negative refractive index properties. Our consideration includes a survey of previously known results as well as identification of the phenomena that are important for applications of this new field. We focus on optical behavior of thin films as well as multi-wave interactions.

磁电材料中的光传播：光学系数在折射率调制中的作用

Light propagation in magnetoelectric materials: The role of optical coefficients in refractive index modulation

本文在无损耗无色散条件下研究含线性与非线性光学系数的磁电材料中电磁波传播，推导磁电系数与折射率的直接关系，以实现各非线性系数分量的光学测量。

Total transmission and total reflection by zero index materials

In this report, we achieved total transmission and reflection in a slab of zero index materials with defect(s). By controlling the defect's radius and dielectric constant, we can obtain total transmission and reflection of EM wave. The zero index materials, in this report, stand for materials with permittivity and permeability which are simultaneously equal to zero or so called matched impedance zero index materials. Along with theoretical calculations and simulation demonstrations, we also discuss about some possible applications for the proposed structure such as shielding or cloaking an obj…

Anomalous refraction of optical space-time wave packets

Refraction at the interface between two materials is fundamental to the interaction of light with photonic devices and to the propagation of light through the atmosphere at large. Underpinning the traditional rules for the refraction of an optical field is the tacit presumption of the separability of its spatial and temporal degrees-of-freedom. We show here that endowing a pulsed beam with precise spatio-temporal spectral correlations unveils remarkable refractory phenomena, such as group-velocity invariance with respect to the refractive index, group-delay cancellation, anomalous group-veloci…

Chern numbers for the index surfaces of photonic crystals: conical refraction as a basis for topological materials

The classification of bandstructures by topological invariants provides a powerful tool for understanding phenomena such as the quantum Hall effect. This classification was originally developed in the context of electrons, but can also be applied to photonic crystals. In this paper we study the topological classification of the refractive index surfaces of two-dimensional photonic crystals. We consider crystals formed from birefringent materials, in which the constitutive relation provides an optical spin-orbit coupling. We show that this coupling, in conjunction with optical activity, can lea…

Comment on 'Propagation and Negative Refraction,' IEEE Microwave Magazine, pp. 58-65, July/August 2012

We discuss and clarify some misleading statements appeared in a recent article on negative refraction in metamaterials. In this comment, we straighten the physical meaning and underlying phenomena behind negative refraction and negative index metamaterials and show that these phenomena are perfectly consistent with causality. It is hoped that this comment draws the attention of authors, reviewers and readers to the large body of rigorous analytical, numerical, and experimental evidence in favor of negative refraction at a single interface, so as to avoid reviving settled debates which mislead,…