在可见频率下具有负磁导率的纳米制造介质

人工超材料中的负Refractive Index

Negative Refractive Index in Artificial Metamaterials

讨论了具有负磁导率和负介电常数的人工超材料的光学常数。利用有效场论，我们计算了由成对的相同的金纳米柱组成的纳米材料在可见光谱内具有磁响应的有效磁导率。

Dual-band, double-negative, polarization-independent metamaterial for the visible spectrum

We present the first dual-band negative index metamaterial that operates in the visible spectrum. The optimized four-functional-layer metamaterial structure exhibits the first double-negative (i.e., simultaneously negative permittivity and permeability) band in the red region of the visible spectrum with a figure of merit of 1.7 and the second double-negative band in the green region of the visible spectrum with a figure of merit of 3.2. The optical behavior of the proposed structure is independent of the polarization of the incident field. This low-loss metamaterial structure can be treated a…

A copper negative index metamaterial in the visible / near-infrared

We propose a design for a plasmonic copper metamaterial with a negative index of refraction at visible/near-infrared wavelengths. Using numerical simulations, we demonstrate negative refraction by a copper metamaterial prism, and perform a parameter extraction technique to verify the sign of the effective, electric permittivity and magnetic permeability. Our proposed design has a figure of merit comparable to similar silver-based metamaterials operating in the visible/near-infrared range. These findings have implications for the design of low cost plasmonic devices and negative-index metamater…

在可见光范围内朝向各向同性负磁性

Towards isotropic negative magnetics in the visible range

从先前的出版物中已知的可见频率范围内的各向同性共振磁性的想法是在考虑到现代化学的成就的情况下发展的。等离子体胶体纳米粒子覆盖二氧化硅核心形成具有共振和各向同性磁响应的簇。给出了两个近似模型的定性相互协议被用来评估集团的磁极化率。结果表明，纳米胶体的静电相互作用降低了一个单独的复杂的磁散射体（纳米团簇）的谐振频率相比，先前研究的变体的平面圆形纳米团簇具有相同的大小。这意味着纳米团簇的光学尺寸的减小，这大概允许人们避免在负磁导率的频率范围内的强空间色散。

Surface plasmon driven scalable low-loss negative-index metamaterials at visible spectrum

We demonstrate that surface plasmons of a thin metal film interacting with a periodic array of nano-structures around it can be utilized to make bulk negative index metamaterials at visible spectrum with simultaneously negative permittivity and permeability. These surface plasmon driven metamaterials have high figure of merit and can be tuned arbitrarily to operate at any wavelength in the visible spectrum and possibly at ultraviolet spectrum. We numerically demonstrate the idea by a metamaterial structure which exhibits a strong magnetic response resulting in a negative index of refraction in…

Negative permittivity and permeability of gold nanorods metamaterials in UV- Vis region

In this article, we report the growth of gold nanorods on glass substrates and copper nanoparticle thin films by cylindrical direct current magnetron sputtering (CDCMS) at room temperature. The grown gold nanorods have short lengths of < 20nm and show negative optical parameters in UV-Vis region. So far negative permittivity and permeability were only shown for complex artificial structures. In a case of simple structures like gold nanorods, the negative optical parameters were only predicted by simulation methods and considering ideal structures and they were not yet reported by experimental …