Polarizers have been intensively investigated theoretically and experimentally, with innovative device designs and emerging optical materials. However, the polarization state and extinction ratio in a waveguide polarizer are not changeable, owing to the passive device operation principles. In this study, a polarization‐switchable graphene waveguide polarizer based on the polarization‐dependent light absorption of graphene film of different thicknesses and micro‐opto‐mechanical systems (MOMS) technology is demonstrated. A superstrate on which graphene layers of different thicknesses are integrated is positioned on the optical waveguide core, and is mechanically pushed to suppress the unwanted polarization state. Graphene thickness on the superstrate plays a key role in switching the device's polarization state: A few‐layer graphene film on the superstrate attenuates the transverse‐electric (TE) mode, making the device transverse‐magnetic (TM) passing, while a many‐layer graphene diminishes the TM mode, making the device TE passing. The dynamic optical attenuation function is automatically configured via accurate and discrete mechanical adjustment of the air gap between the superstrate and the waveguide core. The theoretical simulation and the experimental result exhibit good agreement. This work introduces an idea for tuning the polarization state in a polarization diverse coherent optical system and may contribute to a wide range of applications in MOMS systems.

中文翻译：

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基于石墨烯的聚合物波导偏振器中的偏振控制

偏光镜已经在理论和实验上进行了深入研究，并采用了创新的器件设计和新兴的光学材料。然而，由于无源器件的工作原理，波导偏振器中的偏振态和消光比不能改变。在这项研究中，展示了一种偏振可切换石墨烯波导偏振器，该偏振器基于不同厚度的石墨烯薄膜的偏振相关光吸收和微光机械系统（MOMS）技术。在其上集成有不同厚度的石墨烯层的覆盖层位于光波导芯上，并被机械推动以抑制不希望的偏振态。覆盖板上的石墨烯厚度在切换器件的偏振态中起着关键作用：覆盖层上的几层石墨烯薄膜会减弱横向电（TE）模式，使器件横向磁（TM）通过，而多层石墨烯会减小TM模式，从而使器件TE通过。动态光学衰减功能是通过对上层板和波导芯之间的气隙进行精确和离散的机械调整来自动配置的。理论仿真与实验结果吻合良好。这项工作介绍了一种在偏振分集相干光学系统中调整偏振态的想法，并且可能有助于MOMS系统中的广泛应用。动态光学衰减功能是通过对上层板和波导芯之间的气隙进行精确和离散的机械调整来自动配置的。理论仿真与实验结果吻合良好。这项工作提出了一种在偏振分集相干光学系统中调整偏振态的想法，并且可能有助于MOMS系统中的广泛应用。动态光学衰减功能是通过对上层板与波导纤芯之间的气隙进行精确且离散的机械调节来自动配置的。理论仿真与实验结果吻合良好。这项工作提出了一种在偏振分集相干光学系统中调整偏振态的想法，并且可能有助于MOMS系统中的广泛应用。