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Multifunctional Metamirrors for Broadband Focused Vector-Beam Generation

机译：用于宽带聚焦矢量束生成的多功能元镜

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摘要

Reducing a set of bulk optics-based components to a single ultrathin and compact element that enables the same complex functionality has become an emerging research area, propelling further miniaturization and integration in photonics. In this work, it is designed and experimentally demonstrated a multifunctional metamirror for focused vector-beams generation in the near-infrared range using gap-surface plasmon meta-atoms that enable efficient linear-polarization conversion along with the complete phase control over reflected fields, reproducing thereby the combined functionalities of conventional parabolic reflectors and spatial light modulators. The proof-of-concept fabricated metamirror exhibits the excellent capability of radial- and azimuthal-polarization conversion (approximate to 78% and approximate to 75% on average) and focusing (average efficiency of approximate to 35% and approximate to 34%) within the wavelength range of 800-950 nm under x- and y-excitation, respectively. It is further shown that this approach can be extended to realize multifocal metamirrors with distinctly engineered wavefronts focused at different locations in the same focal plane. The multifunctional metamirror design developed in this study opens new avenues in the advanced research and applications targeting photonics integration of diversified functionalities.
机译：将一组基于大块光学器件的组件缩减为一个具有相同复杂功能的超薄而紧凑的元件，已成为新兴的研究领域，推动了光子学的进一步小型化和集成化。在这项工作中，它被设计并通过实验证明了一种多功能间隙镜，该间隙镜用于在近红外范围内聚焦的矢量束，使用间隙表面等离子体激元原子实现了有效的线偏振转换以及对反射场的完整相位控制，从而再现了常规抛物面反射器和空间光调制器的组合功能。概念验证制造的后镜在径向和方位角偏振转换（平均约78％，平均约75％）和聚焦（平均效率约35％，约34％）方面表现出出色的能力在x和y激发下的波长范围分别为800-950 nm。进一步表明，该方法可以扩展为实现具有集中设计在同一焦平面上不同位置的波前的多焦点元镜。在这项研究中开发的多功能元镜设计为针对各种功能的光子集成的高级研究和应用开辟了新途径。

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