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Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures

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High numerical aperture microwave metalens.

Yong-Qiang Liu, Jinhai Sun, Yongxing Che

|November 13, 2020

Summary

Researchers developed an ultrathin microwave metalens with a high numerical aperture (NA) exceeding 0.9. This metalens achieves sub-wavelength focusing, demonstrating potential for advanced miniaturized devices.

Area of Science:

Metamaterials and Nanophotonics
Microwave Engineering
Optics and Electromagnetics

Background:

The numerical aperture (NA) dictates a lens's focusing resolution and light manipulation capabilities.
Existing metalenses often face limitations in achieving high NA, especially in lower frequency bands like microwaves.
Developing ultrathin, high-NA lenses is crucial for miniaturization in various electromagnetic applications.

Purpose of the Study:

To design and demonstrate an ultrathin, high numerical aperture (NA) metalens operating in the microwave spectrum.
To achieve sub-wavelength focusing with high efficiency and a broad operational bandwidth.
To explore the potential of this metalens for advanced applications such as scanning antennas and cloaking devices.

Main Methods:

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Design of a multi-layer complementary split ring resonator (CSRR) structure for full 2π phase shift and high transmission.
Numerical simulations to predict the focusing performance and characteristics of the metalens.
Experimental fabrication and testing to validate the designed metalens' capabilities in the microwave band.

Main Results:

An ultrathin metalens (thickness ~0.23λ) was successfully designed and fabricated.
The metalens achieved efficient focusing of normal incident microwaves to a spot with a full width at half-maximum (FWHM) of ~0.54λ.
A high numerical aperture (NA) exceeding 0.9 was experimentally verified, with a peak focusing efficiency of 48% over a broad frequency range (7.5–10 GHz).

Conclusions:

The demonstrated ultrathin, high-NA microwave metalens exhibits performance comparable or superior to optical counterparts.
This work represents a significant advancement in developing high-performance metalenses for lower frequency applications.
The proposed metalens technology can enable novel miniaturized devices, including high-gain antennas and retroreflectors.