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Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

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Metasurface-enabled broadband beam splitters integrated with quarter-wave plate functionality.

Fei Ding¹, Rucha Deshpande, Chao Meng

¹Centre for Nano Optics, University of Southern Denmark, Campusvej 55, DK-5230 Odense, Denmark. feid@mci.sdu.dk.

|June 27, 2020

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Metasurfaces enable miniaturized optical devices by combining beam splitting and quarter-wave plate (QWP) functions. This breakthrough integrates power splitting and polarization conversion, paving the way for compact photonics.

Area of Science:

Optics and Photonics
Metamaterials Science
Nanotechnology

Background:

Conventional beam splitters and wave plates are bulky, especially when combined.
Miniaturization is crucial for advanced optical systems and integrated photonics.

Purpose of the Study:

To design and demonstrate a metasurface combining beam splitting and quarter-wave plate (QWP) functionality.
To achieve simultaneous power splitting and circular-to-linear polarization conversion in the near-infrared range.
To enable photonics integration and miniaturization.

Main Methods:

Design of a metasurface using gap-plasmon meta-atoms.
Utilizing meta-atoms as QWPs for polarization conversion and phase control.
Experimental demonstration of beam splitting and polarization conversion in the 750-950 nm range.

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Last Updated: Dec 17, 2025

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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers

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Main Results:

Metasurface achieved efficient, equal splitting of circularly polarized light into two beams.
Complete suppression of specular reflection (<1%) and second-order diffraction.
High circular-to-linear conversion efficiency and splitting efficiencies >50% at 850 nm.
Broadband operation from 750-950 nm.

Conclusions:

The developed metasurface successfully integrates beam splitting and QWP functionalities.
This approach offers a compact alternative to conventional optical components.
Opens new avenues for miniaturized optical systems and integrated photonics.