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High-efficiency chirality-modulated spoof surface plasmon meta-coupler.

Jingwen Duan^1,2, Huijie Guo³, Shaohua Dong^1,2

¹Shanghai Engineering Research Center of Ultra-Precision Optical Manufacturing, Green Photonics and Department of Optical Science and Engineering, Fudan University, Shanghai, 200433, China.

Scientific Reports

|May 4, 2017

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This summary is machine-generated.

This study presents a novel method for efficiently exciting spoof surface plasmon polaritons (SPPs) with controllable directions using Pancharatnam-Berry metasurfaces. The new design significantly improves conversion efficiency, overcoming previous limitations in photonic applications.

Area of Science:

Photonics and Metamaterials
Plasmonics
Electromagnetics

Background:

Efficient excitation of surface plasmon polaritons (SPPs) is crucial for photonic applications.
Existing methods like prism and grating couplers lack flexible control over SPP excitation direction.
Pancharatnam-Berry (PB) metasurfaces offer direction control but suffer from low efficiency due to reflections and mode mismatch.

Purpose of the Study:

To develop a high-efficiency method for direction-controllable spoof SPP excitation.
To overcome the limitations of low efficiency and mode mismatch in PB metasurface-based SPP couplers.
To design and demonstrate a practical device for enhanced SPP excitation.

Main Methods:

Imposing two design criteria for both the metasurface and plasmonic metal.

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Designing and fabricating a device operating in the microwave regime.

Conducting near-field and far-field measurements for validation.

Performing full-wave simulations for performance analysis and optimization.

Main Results:

Achieved a spoof SPP conversion efficiency of approximately 78% in a fabricated microwave device.
Demonstrated significantly higher efficiency compared to previous PB metasurface-based devices.
Experimental results showed good agreement with full-wave simulations.
Simulations indicated potential for efficiency up to 92% with optimized designs.

Conclusions:

The proposed design criteria enable highly efficient, direction-controllable spoof SPP excitation.
The findings pave the way for improved spoof SPP applications, especially in low-frequency regimes.
This work can enhance spin-dependent light-matter interactions in plasmonic devices.