Yao Jie, Tsai Kun-Tong, Wang Yuan, Liu Zhaowei, Bartal Guy, Wang Yuh-Lin, Zhang Xiang
National Science Foundation Nanoscale Science and Engineering Center, 5130 Etcheverry Hall, University of California, Berkeley, CA 94720-1740, USA.
Opt Express. 2009 Dec 7;17(25):22380-5. doi: 10.1364/OE.17.022380.
It has been shown that an anisotropic metamaterial made of nanowire array can realize negative refraction of light even without a negative phase index of refraction. Such non-resonant bulk material can be fabricated by bottom-up electrochemical method. Using this material, we were able to achieve lensing action with micron-thick slab and demonstrate imaging of a slit object. The details of the focused light beam in 3-dimensional space have been mapped with near field scanning optical microscope (NSOM).
已经表明，由纳米线阵列制成的各向异性超材料即使在没有负折射率相位指数的情况下也能实现光的负折射。这种非共振块状材料可以通过自下而上的电化学方法制造。使用这种材料，我们能够用微米厚的平板实现透镜作用，并演示狭缝物体的成像。利用近场扫描光学显微镜（NSOM）绘制了三维空间中聚焦光束的详细信息。
