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Excite Spoof Surface Plasmons with Tailored Wavefronts Using High-Efficiency Terahertz Metasurfaces.
Zhuo Wang1, Shiqing Li2, Xueqian Zhang3
1State Key Laboratory of Surface Physics Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education) Fudan University Shanghai 200433 China.
Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|October 12, 2020
Summary
This study presents an ultracompact device for efficient spoof surface plasmon (SSP) excitation and wavefront engineering in terahertz photonics. The meta-coupler achieves high-efficiency conversion and chirality-dependent bifunctional wavefront control.
Area of Science:
- Terahertz (THz) photonics
- Near-field optics
- Metamaterials
Background:
- Spoof surface plasmons (SSPs) are essential for THz near-field photonics.
- Challenges exist in high-efficiency SSP excitation and wavefront engineering.
- These limitations hinder practical applications of SSPs.
Purpose of the Study:
- To propose a scheme for simultaneous high-efficiency excitation and wavefront engineering of SSPs.
- To demonstrate an ultracompact device for achieving these goals.
- To enable advanced functionalities in THz near-field manipulation.
Main Methods:
- Design of a gradient meta-coupler using Pancharatnam-Berry (PB) meta-atoms.
- Encoding parabolic phase profiles for wavefront control.
- Combining PB and resonance phase mechanisms for bifunctional engineering.
Main Results:
- Achieved absolute efficiency up to 60% for converting circularly polarized (CP) THz beams into SSPs.
- Demonstrated chirality-dependent focusing and defocusing of SSP wavefronts.
- Realized chirality-delinked bifunctional wavefront engineering via combined phase mechanisms.
Conclusions:
- The developed meta-device efficiently excites SSPs and enables versatile wavefront engineering.
- This work paves the way for ultracompact integrated devices for THz near-field manipulation.
- Potential applications include optical sensing, imaging, and on-chip photonics.
