The control of the polarization states of light plays an important role in modern optical systems. However, traditional polarization manipulating devices often have narrow bandwidth and their large size makes it difficult for them to achieve miniaturization and integration of optical systems. This work presents an ultrathin quarter waveplate with a periodic silver film 2 × 2 rectangular hole array with a thickness less than λ/50. Numerical simulation shows that the waveplate can efficiently transform a circular polarized wave into a linearly polarized one at the center of 1550 nm, and its bandwidth is 525 nm. Furthermore, the quarter waveplate can efficiently invert linear polarization into circular polarization at 1550 nm, which ellipticity is near unit. With an array of small holes on a metal film to enhance transmission, this structure can increase the transmission to 0.44. The broadband quarter waveplate can be used in communication system and near infrared band system, and be integrated with other optical devices at nanoscale to achieve polarization operation, detection, and sensing.

中文翻译：

---

基于等离子共振的矩形孔阵列宽带超薄传输四分之一波片。

光的偏振态的控制在现代光学系统中起着重要的作用。然而，传统的偏振操纵装置通常具有窄的带宽，并且它们的大尺寸使得它们难以实现光学系统的小型化和集成。这项工作提出了一种超薄的四分之一波片，其具有周期性的银膜2×2矩形孔阵列，厚度小于λ/ 50。数值模拟表明，该波片可以有效地将圆偏振波转换为中心波长为1550 nm的线偏振波，其带宽为525 nm。此外，四分之一波片可以有效地将线性偏振转换为1550 nm处的圆偏振，其椭圆率接近单位。在金属膜上有许多小孔以增强透射率，这种结构可以将透射率提高到0.44。宽带四分之一波片可用于通信系统和近红外波段系统，并且可以与其他纳米级光学设备集成在一起，以实现偏振操作，检测和传感。