They then cascaded the negative index medium with a positive refractiveindex medium so that the complete nanostructure behaved as one with an index of refraction of zero.
他们将负折射率材料和正折射率材料级联起来成功实现了零折射率行为的纳米结构。
2
In natural materials, light waves entering at an Angle always bend to plunge more steeply into the material-the hallmark of a refractiveindex greater than 1.
在自然物质中，以一定角度进入的光波，进入物质后的角度更小——标志着折射率大于1。
3
The technique can image variations in what is known as the refractiveindex of air - in essence, the speed of light in a given medium.