Parimi P V, Lu W T, Vodo P, Sokoloff J, Derov J S, Sridhar S
Department of Physics and Electronic Materials Research Institute, Northeastern University, 360 Huntington Avenue, Boston, Massachusetts 02115, USA.
Phys Rev Lett. 2004 Mar 26;92(12):127401. doi: 10.1103/PhysRevLett.92.127401. Epub 2004 Mar 22.
We demonstrate the negative refraction of microwaves in a metallic photonic crystal prism. The spectral response of the photonic crystal prism, which manifests both positive and negative refraction, is in complete agreement with band-structure calculations and numerical simulations. The validity of Snell's law with a negative refractive index is confirmed experimentally and theoretically. The negative refraction observed corresponds to left-handed electromagnetism that arises due to the dispersion characteristics of waves in a periodic medium. This mechanism for negative refraction is different from that in metamaterials.
我们展示了金属光子晶体棱镜中微波的负折射现象。光子晶体棱镜的光谱响应同时表现出正折射和负折射，这与能带结构计算和数值模拟完全吻合。实验和理论均证实了具有负折射率的斯涅尔定律的有效性。观察到的负折射对应于由于波在周期性介质中的色散特性而产生的左手电磁学现象。这种负折射机制与超材料中的不同。
