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Quasi-continuous linear phase-gradient metamaterial based on conformal spoof surface plasmon polaritons
Optics Express
|April 6, 2021
Summary
Researchers developed a novel method using conformal spoof surface plasmon polaritons (SSPPs) to create a quasi-continuous linear phase gradient. This technique enables high-efficiency anomalous refraction for transmitted waves in dual-band metamaterials.
Area of Science:
- Metamaterials
- Plasmonics
- Electromagnetics
Background:
- Spoof surface plasmon polaritons (SSPPs) offer unique electromagnetic properties.
- Achieving precise phase control in metamaterials is crucial for wave manipulation.
Purpose of the Study:
- To propose a method for quasi-continuous linear phase gradient using conformal SSPPs.
- To demonstrate high-efficiency anomalous refraction in dual-band metamaterials.
Main Methods:
- Designed high-transmission SSPP unit cells.
- Arranged SSPP structures conformally to a brachistochrone curve to achieve a linear phase gradient.
- Fabricated and measured a dual-band transmissive metamaterial operating in X and Ku bands.
Main Results:
- Realized a quasi-continuous linear Pancharatnam-Berry (PB) phase profile along one transverse direction.
- Achieved high-efficiency anomalous refraction in both X and Ku bands.
- Demonstrated that the conformal SSPP structure allows desired anomalous refraction without PB phase reconstruction.
Conclusions:
- The conformal SSPP method provides a new strategy for anomalous refraction.
- This approach offers precise control over phase gradients for wave manipulation.
- Potential applications include beam steering and digital beam forming.
