Gutiérrez L, Díaz-de-Anda A, Flores J, Méndez-Sánchez R A, Monsivais G, Morales A
Centro de Ciencias Físicas, Universidad Nacional Autónoma de México, P.O. Box 48-3, 62251 Cuernavaca Mor., Mexico.
Phys Rev Lett. 2006 Sep 15;97(11):114301. doi: 10.1103/PhysRevLett.97.114301. Epub 2006 Sep 13.
The optical analogues of Bloch oscillations and their associated Wannier-Stark ladders have been recently analyzed. In this Letter we propose an elastic realization of these ladders, employing for this purpose the torsional vibrations of specially designed one-dimensional elastic systems. We have measured, for the first time, the ladder wave amplitudes, which are not directly accessible either in the quantum-mechanical or optical cases. The wave amplitudes are spatially localized and coincide rather well with theoretically predicted amplitudes. The rods we analyze can be used to localize different frequencies in different parts of the elastic systems and vice versa.
布洛赫振荡及其相关的万尼尔 - 斯塔克阶梯的光学类似物最近已被分析。在本信函中，我们提出了这些阶梯的一种弹性实现方式，为此采用了专门设计的一维弹性系统的扭转振动。我们首次测量了阶梯波振幅，这在量子力学或光学情形中均无法直接获取。这些波振幅在空间上是局域化的，并且与理论预测的振幅相当吻合。我们所分析的杆可用于在弹性系统的不同部分中定位不同频率，反之亦然。
