This exact control of optical phase is based on a unique combination of negative and positive refractive indices.
精确得控制光子相位是基于独特得组合负和正的折射率器件。
2
In normal optical fibres made from materials with positive refractive indices, this makes the effective thickness of the cable greater than its physical thickness.
在正常的用具有阳性折射指数制作的多个光导纤维中，这种情况会让电缆的有效厚度高于它的实际物理厚度。
3
The orientations of all developing facets in the crystals and their Miller indices have been determined by means of X-ray and optical method.