Title: Visual observation of optical Floquet-Bloch oscillations Show Chinese title

Title: 光学弗洛凯-布洛赫振荡的视觉观察

Abstract: Bloch oscillations, an important transport phenomenon, have extensively been studied in static systems but remain largely unexplored in Floquet systems. Here, we propose a new type of Bloch oscillations, namely the "Floquet-Bloch oscillations," which refer to rescaled Bloch oscillations with a period of extended least common multiple of the modulation and Bloch periods. We report the first visual observation of such Floquet-Bloch oscillations in femtosecond-laser-written waveguide arrays by using waveguide fluorescence microscopy. These Floquet-Bloch oscillations exhibit exotic properties, such as fractal spectrum and fractional Floquet tunneling. This new transport mechanism offers an intriguing method of wave manipulation, which has significant applications in coherent quantum transport. Show Chinese abstract

Abstract: 布洛赫振荡是一种重要的输运现象，在静态系统中已被广泛研究，但在弗洛凯系统中仍大多未被探索。 在这里，我们提出了一种新型的布洛赫振荡，即“弗洛凯-布洛赫振荡”，指的是周期为调制周期和布洛赫周期的扩展最小公倍数的缩放布洛赫振荡。 我们通过波导荧光显微镜首次在飞秒激光写入的波导阵列中观察到了这种弗洛凯-布洛赫振荡。 这些弗洛凯-布洛赫振荡表现出奇特的特性，如分形谱和分数弗洛凯隧穿。 这种新的输运机制提供了一种引人入胜的波操控方法，在相干量子输运中有重要的应用。