Veselago lensing with ultracold atoms in an optical lattice
Veselago lensing with ultracold atoms in an optical lattice
复制标题
DOI：
10.1038/ncomms4327
复制
发表时间：
2014-02
影响因子：
16.6
通讯作者：
Martin Leder;C. Grossert;M. Weitz
中科院分区：
文献类型：
--
作者：
Martin Leder;C. Grossert;M. Weitz
Veselago指出，电磁波理论允许具有负折射率的材料，其中大多数已知的光学现象将被逆转。这种材料的平板可以通过负折射来聚焦光线，这是一种与传统的正折射率光学器件截然不同的成像技术，在传统的正折射率光学器件中，曲面弯曲光线以形成物体的图像。在这里，我们展示了物质波的Veselago透镜，使用光学晶格中的超冷原子。利用双色光学晶格势实现了铷原子的相对论性即类光子色散关系。我们依靠拉曼π脉冲技术在色散关系的两个不同分支之间转移原子，导致完全类似于Veselago描述的光波效应的聚焦。所展示的效果的未来前景包括新的亚布罗意波长成像应用。
Veselago pointed out that electromagnetic wave theory allows for materials with a negative index of refraction, in which most known optical phenomena would be reversed. A slab of such a material can focus light by negative refraction, an imaging technique strikingly different from conventional positive refractive index optics, where curved surfaces bend the rays to form an image of an object. Here we demonstrate Veselago lensing for matter waves, using ultracold atoms in an optical lattice. A relativistic, that is, photon-like, dispersion relation for rubidium atoms is realized with a bichromatic optical lattice potential. We rely on a Raman π-pulse technique to transfer atoms between two different branches of the dispersion relation, resulting in a focusing that is completely analogous to the effect described by Veselago for light waves. Future prospects of the demonstrated effects include novel sub-de Broglie wavelength imaging applications.