Li Jing, Liu Chang, Wu Tiesheng, Liu Yumin, Wang Yu, Yu Zhongyuan, Ye Han, Yu Li
State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing, 100876, China.
College of Information and Communication Engineering, Guilin University of Electronic Technology, Guilin, 541004, China.
Nanoscale Res Lett. 2019 Jan 25;14(1):34. doi: 10.1186/s11671-019-2867-4.
In this paper, we present an all-dielectric gradient metasurface, composed of periodic arrangement of differently sized cross-shaped silicon nanoblocks resting on the fused silica substrate, to realize the function of polarization split in visible region. The cross-shaped silicon block arrays can induce two opposite transmission phase gradients along the x-direction for the linear x-polarization and y-polarization. By properly designing, the metasurface can separate the linearly polarized light into x- and y-polarized ones, which propagate at the same angle along the left and right sides of the normal incidence in the x-z plane. Particularly, when a beam with the polarization angle of 45.0° is incident on the proposed device, the x- and y-polarized transmitted ones possess nearly equal intensity within the wavelength range from 579 to 584 nm. We expect the proposed polarization beam splitter can play an important role for future free-space optical devices.
在本文中，我们展示了一种全介质梯度超表面，它由放置在熔融石英衬底上的不同尺寸十字形硅纳米块的周期性排列组成，以实现可见光区域的偏振分离功能。十字形硅块阵列可以为线性x偏振和y偏振沿x方向诱导两个相反的传输相位梯度。通过适当设计，该超表面可以将线偏振光分离为x偏振光和y偏振光，它们在x-z平面内沿法线入射的左右两侧以相同角度传播。特别地，当偏振角为45.0°的光束入射到所提出的器件上时，在579至584nm的波长范围内，x偏振和y偏振的透射光具有几乎相等强度。我们期望所提出的偏振分束器能够在未来的自由空间光学器件中发挥重要作用。
