Pancharatnam–Berry-Phase-Based Plasmonic Metasurfaces Enable Wavelength-Selective Directional Focusing and Vortex

IF 3.7 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Heyi Zhang, Chunhui Zhu, Zhengyong Song
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Abstract

Multifoci focusing has always been a problem that researchers continue to pay attention to and urgently needs to be solved. Metasurfaces display unprecedented capabilities and flexibilities to solve this problem. In this work, Pancharatnam–Berry (PB)-phase-based plasmonic metasurfaces are presented to realize wavelength-selective directional focusing on the same focal plane. Ultrathin meta-atoms with the half-wave plate effect have only three layers, and 360° phase modulation is obtained by axially rotating gold strip based on PB phase. Two metasurfaces are designed to verify our strategy. Above all, a wavelength-selective directional focusing metasurface is presented to converge right-handed circularly polarized wave with wavelengths of 187, 271, and 355 μm at different predetermined positions at 810 μm. Next, the second metasurface exhibits the function that three vortex beams carrying orbital angular momentums with different topological charges can be produced under the irradiation of incident wave at the aforementioned wavelengths. In this research, a solid step is paved toward practical applications of flat photonics.

Abstract Image

基于潘查拉特南-浆果相的质子元表面可实现波长选择性定向聚焦和涡流
多焦点聚焦一直是研究人员持续关注并亟待解决的问题。元表面在解决这一问题方面展现出前所未有的能力和灵活性。本研究提出了基于 Pancharatnam-Berry (PB) 相的质子元表面,以在同一焦平面上实现波长选择性定向聚焦。具有半波板效应的超薄元原子只有三层,通过轴向旋转基于 PB 相位的金条可实现 360° 相位调制。我们设计了两个元表面来验证我们的策略。首先是波长选择性定向聚焦元表面,可在 810 μm 处的不同预定位置汇聚波长为 187、271 和 355 μm 的右手圆极化波。其次,第二个元表面的功能是在上述波长的入射波照射下,产生三个携带不同拓扑电荷的轨道角动量的涡流束。这项研究为平面光子学的实际应用迈出了坚实的一步。
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