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Controlling Radiation Beams by High-Efficiency Metasurfaces with Enhanced Refractive Index Elements.
Youpeng Bao1,2, Xue Ren3,2, Shaowei Liao1
1Guangdong Provincial Key Laboratory of Millimeter-Wave and Terahertz School of Electronic and Information Engineering, South China University of Technology, Guangzhou 510006, China.
ACS Applied Materials & Interfaces
|August 9, 2023
Summary
This study introduces a novel nonresonant metasurface (MS) with strong capacitive coupling, achieving a high refractive index for efficient electromagnetic wavefront manipulation. The ultrathin transmissive MS demonstrates excellent performance, paving the way for advanced functional devices.
Area of Science:
- Electromagnetism
- Materials Science
- Nanotechnology
Background:
- Metasurfaces (MSs) are crucial for manipulating electromagnetic wavefronts, with amplitude and phase control being highly sought after.
- Previous metasurface designs primarily relied on resonance effects, limiting their performance and bandwidth.
Purpose of the Study:
- To present a nonresonant metamaterial element with enhanced capacitive coupling for broadband electromagnetic wave manipulation.
- To design and experimentally validate an ultrathin transmissive metasurface with high efficiency.
Main Methods:
- Developed a broadband sandwich-structured meta-atom exhibiting an enhanced refractive index (2.44–8.90).
- Designed a gradient index metasurface comprising a core layer (CL) and two impedance matching layers (IMLs).
- Integrated the metasurface with a transmitting antenna to convert spherical surface waves into plane waves.
Main Results:
- Achieved an ultrathin transmissive metasurface with a thickness of 0.23 free-space wavelengths.
- Demonstrated efficient conversion of spherical surface waves to plane waves.
- Experimentally verified a maximum measured efficiency exceeding 85% for the transmissive metasurface.
Conclusions:
- The proposed nonresonant metasurface offers enhanced design flexibility and broadband application potential.
- This approach enables the realization of efficient functional devices for electromagnetic wavefront manipulation.
- The enhanced refractive index and ultrathin profile represent significant advancements in metasurface technology.
