Fresnel diffraction mirror for an atomic wave
Fresnel diffraction mirror for an atomic wave
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DOI：
10.1103/physrevlett.94.013203
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发表时间：
2005-01-14
影响因子：
8.6
通讯作者：
Shimizu, F
中科院分区：
文献类型：
--
作者：
Oberst, H;Kouznetsov, D;Shimizu, F
我们已经在实验上证明了一种与材料无关的原子波反射镜，它利用了平行脊阵列上的菲涅耳衍射。He ~*（2S-3（1））和Ne ~*（1 s（3））原子波在具有微加工光栅结构的硅板上相干反射。我们测量了掠入射时的反射率随入射速度和入射角的变化。我们的数据表明，这种类型的反射镜的反射率只取决于脊之间的距离，波长和入射角，但不敏感的光栅结构的材料。观察到的反射率增加了2个数量级，相比，一个平坦的抛光硅表面，其中的反射是由有吸引力的表面电位。对于He* 原子，对于低于约25 cm/s的法向入射速度，测得的反射率超过10%。
We have experimentally demonstrated a material-independent mirror for atomic waves that uses the Fresnel diffraction at an array of parallel ridges. He* (2 S-3(1)) and Ne* (1s(3)) atomic waves were reflected coherently on a silicon plate with a microfabricated grating structure, consisting of narrow wall-like ridges. We measured the reflectivity at grazing incidence as a function of the incident velocity and angle. Our data show that the reflectivity on this type of mirror depends only on the distance between the ridges, the wavelength, and the incident angle, but is insensitive to the material of the grating structure. The reflectivity is observed to increase by 2 orders of magnitude, compared to that of a flat polished silicon surface, where the reflection is caused by the attractive surface potential. For He* atoms, the measured reflectivity exceeds 10% for normal incident velocities below about 25 cm/s.