Anisotropic Temporal Metasurfaces for Tunable Ultrafast Photoactive Switching Dynamics,Laser & Photonics Reviews

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Anisotropic Temporal Metasurfaces for Tunable Ultrafast Photoactive Switching Dynamics
Laser & Photonics Reviews ( IF 9.8 ) Pub Date : 2021-08-16 , DOI: 10.1002/lpor.202100244
Yuze Hu _{1,

2} , Hao Hao ₃ , Jun Zhang ₃ , Mingyu Tong ₁ , Xiangai Cheng ₁ , Tian Jiang _{1,

2}

Affiliation

Recent progress in miniaturized photonic devices has promoted the development of metasurfaces for multidimensional manipulation of optical light fields. One significant example is the polarization multiplexing metadevice, which has earned considerable attention because of its low crosstalk and tremendous polarization-controlled functionalities for numerous applications, such as wavefront steering, holography, and display. Here, a novel metasurface platform is demonstrated for photoactive terahertz switching by encoding the temporal modulation dynamic into the polarization channels. Coupled plasmonic resonators with four-fold symmetry are utilized to exhibit an isotropic plasmon-induced transparency analog resonance. Unlike typical optically tunable metamaterials that are limited to a single switching speed, this temporal modulation is multiplexed into two sets of polarization profiles. Specifically, the switching dynamic can be alternated between a quasi-steady state with a recovery time larger than 2 ns and an ultrafast transient state with a recovery time of <25 ps in the orthogonal polarization channels. This extraordinary performance is attributed to the high contrast in crystallinity between two photoactive islands embedded in one-unit cell. The long-standing bottleneck of invariant switching dynamics in all-optical metadevices is addressed, which provides a new paradigm for the design of future switchable metamaterial devices.

中文翻译：

用于可调谐超快光敏开关动力学的各向异性时间超表面

微型光子器件的最新进展促进了用于光场多维操纵的超表面的发展。一个重要的例子是偏振复用元设备，由于其低串扰和巨大的偏振控制功能，在波前控制、全息和显示等众多应用中备受关注。在这里，通过将时间调制动态编码到偏振通道中，展示了一种用于光敏太赫兹切换的新型超表面平台。具有四重对称性的耦合等离子体共振器被用来展示各向同性等离子体诱导的透明模拟共振。与受限于单一开关速度的典型光学可调超材料不同，这种时间调制被复用到两组偏振分布中。具体而言，在正交极化通道中，开关动态可以在恢复时间大于 2 ns 的准稳态和恢复时间 <25 ps 的超快瞬态之间交替。这种非凡的性能归因于嵌入单晶胞中的两个光敏岛之间结晶度的高对比度。解决了全光超器件中不变切换动力学的长期瓶颈，这为未来可切换超材料器件的设计提供了新的范例。在正交极化通道中，开关动态可以在恢复时间大于 2 ns 的准稳态和恢复时间 <25 ps 的超快瞬态之间交替。这种非凡的性能归因于嵌入单晶胞中的两个光敏岛之间结晶度的高对比度。解决了全光超器件中不变切换动力学的长期瓶颈，这为未来可切换超材料器件的设计提供了新的范例。在正交极化通道中，开关动态可以在恢复时间大于 2 ns 的准稳态和恢复时间 <25 ps 的超快瞬态之间交替。这种非凡的性能归因于嵌入单晶胞中的两个光敏岛之间结晶度的高对比度。解决了全光超器件中不变切换动力学的长期瓶颈，这为未来可切换超材料器件的设计提供了新的范例。

更新日期：2021-10-19

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