Aydin Koray, Bulu Irfan, Ozbay Ekmel
Opt Express. 2005 Oct 31;13(22):8753-9. doi: 10.1364/opex.13.008753.
We present here the experimental results from research conducted on negative refraction and focusing by a two-dimensional (2D) left-handed metamaterial (LHM) slab. By measuring the refracted electromagnetic (EM) waves from a LHM slab, we find an effective refractive index of -1.86. A 2D scanning transmission measurement technique is used to measure the intensity distribution of the EM waves that radiate from the point source. The flat lens behavior of a 2D LHM slab is demonstrated for two different point source distances of d(s) = 0.5lambda and lambda. The full widths at half maximum of the focused beams are 0.36lambda and 0.4lambda, respectively, which are both below the diffraction limit.
我们在此展示了关于二维左手超材料（LHM）平板的负折射和聚焦特性的实验研究结果。通过测量LHM平板的折射电磁波，我们得到了-1.86的有效折射率。采用二维扫描透射测量技术来测量从点源辐射出的电磁波的强度分布。对于点源距离d(s) = 0.5λ和λ这两种不同情况，展示了二维LHM平板的平透镜特性。聚焦光束的半高宽分别为0.36λ和0.4λ，均低于衍射极限。
