论文标题
光学浮球振荡的视觉观察
Visual observation of optical Floquet-Bloch oscillations
论文作者
论文摘要
Bloch振荡是一种重要的运输现象，已在静态系统中进行了广泛的研究，但在Floquet系统中仍未探索。在这里，我们提出了一种新型的BLOCH振荡，即“ Floquet-Bloch振荡”，该振荡指的是重新验证的Bloch振荡，并具有调制和BLOCH时期的延长最小值的时期。我们通过使用波导荧光显微镜在飞秒激光写入的波导阵列中的这种浮球振荡进行了第一次视觉观察。这些Floquet-Bloch振荡表现出异国情调的特性，例如分形光谱和分数Floquet隧道。这种新的传输机制提供了一种有趣的波浪操作方法，该方法在连贯的量子传输中具有重要的应用。
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.
