They then cascaded the negative index medium with a positive refractive index 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。

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A waveguide is characterized by a region of high refractive index bounded by regions of lower index.

波导就是折射率高的区域由折射率低的区域包裹的结构。

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The test on its optical transmittance was conducted, and analysis of the refractive index profile of a gradient index (GRIN) rod made of the base glass was performed.

制备了自聚焦透镜的基础玻璃，对其透过率进行了测试，并对由这种玻璃制成的梯度折射率(GRIN)棒的折射率分布进行了分析。

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When light travels through glass, it slows down (the amount it slows is measured by a number called the refractive index).

ECONOMIST: A way to detect Earth-sized planets around other stars

From the refractive index of each path it is possible with the application of some suitably crunchy computing power to produce a three-dimensional image.

ECONOMIST: Microscopy

Dr Feld also has plans to use beams of different colours, since each colour has a slightly different refractive index in a given material.

ECONOMIST: Microscopy