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Excite Spoof Surface Plasmons with Tailored Wavefronts Using High‐Efficiency Terahertz Metasurfaces
Advanced Science ( IF 14.3 ) Pub Date : 2020-08-05 , DOI: 10.1002/advs.202000982 Zhuo Wang 1 , Shiqing Li 2 , Xueqian Zhang 3 , Xi Feng 3 , Qingwei Wang 3 , Jiaguang Han 3 , Qiong He 1, 4, 5 , Weili Zhang 6 , Shulin Sun 2, 4 , Lei Zhou 1, 4, 5
Advanced Science ( IF 14.3 ) Pub Date : 2020-08-05 , DOI: 10.1002/advs.202000982 Zhuo Wang 1 , Shiqing Li 2 , Xueqian Zhang 3 , Xi Feng 3 , Qingwei Wang 3 , Jiaguang Han 3 , Qiong He 1, 4, 5 , Weili Zhang 6 , Shulin Sun 2, 4 , Lei Zhou 1, 4, 5
Affiliation
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Spoof surface plasmons (SSPs) play crucial roles in terahertz (THz) near‐field photonics. However, both high‐efficiency excitation and wavefront engineering of SSPs remain great challenges, which hinder their wide applications in practice. Here, a scheme is proposed to simultaneously achieve these two goals efficiently using a single ultracompact device. First, it is shown that a gradient meta‐coupler constructed by high‐efficiency Pancharatnam–Berry (PB) meta‐atoms can convert circularly polarized (CP) THz beams into SSPs with absolute efficiency up to 60%. Encoding a parabolic phase profile into the meta‐coupler based on the PB mechanism, it is demonstrated that the device can covert CP beams into SSPs with focusing or defocusing wavefronts, dictated by the chirality of the incident wave. Finally, two distinct chirality‐dependent phase distributions are encoded into the meta‐coupler design by combining the PB and resonance phase mechanisms, and it is demonstrated that the resulting meta‐device can achieve SSP excitations with chirality‐delinked bifunctional wavefront engineering. THz near‐field experiments are performed to characterize all three devices, in excellent agreement with full‐wave simulations. The results pave the road to realize ultracompact devices integrating different functionalities on near‐field manipulations, which can find many applications (e.g., optical sensing, imaging, on‐chip photonics, etc.) in different frequency domains.
中文翻译：
使用高效太赫兹超表面通过定制波前激发欺骗表面等离子体
欺骗表面等离子体（SSP）在太赫兹（THz）近场光子学中发挥着至关重要的作用。然而，SSP 的高效激发和波前工程仍然面临巨大的挑战，这阻碍了其在实践中的广泛应用。在这里，提出了一种方案，使用单个超紧凑设备同时有效地实现这两个目标。首先，研究表明，由高效 Pancharatnam-Berry (PB) 元原子构建的梯度元耦合器可以将圆偏振 (CP) 太赫兹光束转换为 SSP，绝对效率高达 60%。将抛物线相位分布编码到基于 PB 机制的元耦合器中，证明该设备可以将 CP 光束转换为具有聚焦或散焦波前的 SSP，具体取决于入射波的手性。最后，通过结合PB和共振相位机制，将两种不同的手性相关相位分布编码到元耦合器设计中，并证明所得元器件可以通过手性脱链双功能波前工程实现SSP激发。进行太赫兹近场实验来表征所有三种设备，与全波模拟非常一致。这些结果为实现在近场操作上集成不同功能的超紧凑器件铺平了道路，这些器件可以在不同频域中找到许多应用（例如光学传感、成像、片上光子学等）。
更新日期：2020-10-07
中文翻译：
使用高效太赫兹超表面通过定制波前激发欺骗表面等离子体
欺骗表面等离子体（SSP）在太赫兹（THz）近场光子学中发挥着至关重要的作用。然而，SSP 的高效激发和波前工程仍然面临巨大的挑战，这阻碍了其在实践中的广泛应用。在这里，提出了一种方案，使用单个超紧凑设备同时有效地实现这两个目标。首先，研究表明，由高效 Pancharatnam-Berry (PB) 元原子构建的梯度元耦合器可以将圆偏振 (CP) 太赫兹光束转换为 SSP，绝对效率高达 60%。将抛物线相位分布编码到基于 PB 机制的元耦合器中，证明该设备可以将 CP 光束转换为具有聚焦或散焦波前的 SSP，具体取决于入射波的手性。最后，通过结合PB和共振相位机制，将两种不同的手性相关相位分布编码到元耦合器设计中，并证明所得元器件可以通过手性脱链双功能波前工程实现SSP激发。进行太赫兹近场实验来表征所有三种设备，与全波模拟非常一致。这些结果为实现在近场操作上集成不同功能的超紧凑器件铺平了道路，这些器件可以在不同频域中找到许多应用（例如光学传感、成像、片上光子学等）。
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