Excite Spoof Surface Plasmons with Tailored Wavefronts Using High‐Efficiency Terahertz Metasurfaces
| العنوان: | Excite Spoof Surface Plasmons with Tailored Wavefronts Using High‐Efficiency Terahertz Metasurfaces |
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| المؤلفون: | Qingwei Wang, Qiong He, Lei Zhou, Zhuo Wang, Weili Zhang, Xi Feng, Xueqian Zhang, Shiqing Li, Jiaguang Han, Shulin Sun |
| المصدر: | Advanced Science, Vol 7, Iss 19, Pp n/a-n/a (2020) Advanced Science |
| بيانات النشر: | Wiley, 2020. |
| سنة النشر: | 2020 |
| مصطلحات موضوعية: | Terahertz radiation, General Chemical Engineering, Phase (waves), near field, General Physics and Astronomy, Medicine (miscellaneous), Near and far field, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, Biochemistry, Genetics and Molecular Biology (miscellaneous), Resonance (particle physics), spoof surface plasmons, General Materials Science, wavefronts, lcsh:Science, Physics, Wavefront, Full Paper, business.industry, Surface plasmon, General Engineering, Full Papers, 021001 nanoscience & nanotechnology, metasurfaces, 0104 chemical sciences, Optoelectronics, lcsh:Q, Photonics, 0210 nano-technology, business, plasmonic couplers, Excitation |
| الوصف: | 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. High‐efficiency bifunctional manipulations on surface‐plasmon wavefronts are enabled by a single ultracompact meta‐device. Constructed with meta‐atoms possessing both geometric and resonant phases, the meta‐device exhibits distinct phase profiles for impinging lights with different spins, thus generating independent surface‐plasmon profiles. These findings may find many applications in integration photonics, such as coupling on‐chip optical devices and enhancing light–matter interactions. |
| اللغة: | English |
| تدمد: | 2198-3844 |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::03fc3f2b40b184a6554b1d314a40f87bTest https://doaj.org/article/a2eecbb82abe4df79fe64dd8ed67af0aTest |
| حقوق: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....03fc3f2b40b184a6554b1d314a40f87b |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 21983844 |
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