Zhao Yao, Chen Yang, Hou Zhi-Shan, Han Bing, Fan Hua, Lin Lin-Han, Ren Xi-Feng, Sun Hong-Bo
Opt Lett. 2022 Feb 1;47(3):617-620. doi: 10.1364/OL.448090.
Optical systems provide a new and practical platform for studying Bloch oscillations. This study investigates the fundamental-mode propagation of polarization-dependent Bloch oscillations. By using the three-dimensional properties of femtosecond laser direct writing, we fabricate a polymer-based gradient waveguide array and determine the Bloch oscillations under different polarization inputs by using the birefringence gradient and the equivalent refractive index, thus exhibiting a polarization-dependent Bloch period. Our results provide a new, to the best of our knowledge, paradigm for two-dimensional optical Bloch modes and highlight the influence of optical polarization in the same system, which provides a possibility to observe richer physics related to Bloch oscillations in one structure.
光学系统为研究布洛赫振荡提供了一个新的实用平台。本研究探讨了偏振相关布洛赫振荡的基模传播。通过利用飞秒激光直写的三维特性，我们制作了一个基于聚合物的梯度波导阵列，并利用双折射梯度和等效折射率确定了不同偏振输入下的布洛赫振荡，从而展现出偏振相关的布洛赫周期。据我们所知，我们的结果为二维光学布洛赫模式提供了一种新的范例，并突出了同一系统中光偏振的影响，这为在一种结构中观察与布洛赫振荡相关的更丰富物理现象提供了可能性。
