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Combined Metagratings for Efficient Broad-Angle Scattering Metasurface
Verena Neder1,2, Younes Ra'di3,4, Andrea Alù3,4
1Institute of Physics, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands.
ACS Photonics
|April 30, 2019
Summary
We developed a novel metagrating superstructure for precise light control. This resonant reflector offers tailored angular scattering and high efficiency for optical devices.
Area of Science:
- Nanophotonics
- Metasurfaces
- Optical Engineering
Background:
- Controlling light diffusion and reflection is crucial for optical devices.
- Integrating spectral and directivity control into nanophotonic devices requires advanced interfaces.
Purpose of the Study:
- To present a metagrating superstructure for resonant light reflection with tailored angular scattering.
- To demonstrate flexible control over the metasurface's reflection profile.
Main Methods:
- Fabrication of millimeter-sized metasurfaces using arrays of supercells with multiple metagratings.
- Utilizing silicon (Si) Mie resonators above an silver (Ag) back plane for resonant scattering.
- Employing thin-film deposition, electron beam lithography, and reactive ion etching.
Main Results:
- Achieved tailored angular scattering profiles with high efficiency (>70%) at 650 nm.
- Demonstrated flexible control by creating Lambertian-type and large-angle scattering metasurfaces.
- Scattering into specific diffraction orders (±1) with high efficiency.
Conclusions:
- The developed metagrating superstructure enables efficient and flexible control of light reflection and scattering.
- These ultrathin structures have potential applications in solar cells for light trapping and spectrum splitting.
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