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Updated: Feb 25, 2026

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

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Published on: June 7, 2019

Third-order gap plasmon based metasurfaces for visible light.

Rucha Deshpande, Anders Pors, Sergey I Bozhevolnyi

|August 9, 2017

Summary

This summary is machine-generated.

Metasurfaces using third-order gap surface plasmon (GSP) resonance enable efficient polarization beam splitting for visible light. This approach utilizes larger nanobricks, simplifying fabrication for polarization-controlled light steering applications.

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Last Updated: Feb 25, 2026

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Published on: June 7, 2019

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Published on: July 8, 2013

Area of Science:

Plasmonics and Nanophotonics
Metasurface Optics
Light Manipulation

Background:

Metasurface fabrication accuracy is critical for light control, especially at shorter wavelengths.
Gap surface plasmon (GSP) resonances offer a pathway for metasurface applications.
Third-order GSP resonance allows for larger nanobricks, potentially easing fabrication demands.

Purpose of the Study:

To demonstrate efficient polarization-controlled steering of visible light using GSP-based metasurfaces.
To design and fabricate a metasurface operating as a polarization beam splitter utilizing third-order GSP resonance.
To investigate the performance of such metasurfaces for visible light applications.

Main Methods:

Numerical calculation of reflection amplitude and phase maps for nanobricks on a gold film.
Design of a phase-gradient metasurface using supercells composed of nanobricks with varying dimensions.
Fabrication and experimental characterization of the polarization beam splitter using a supercontinuum light source.

Main Results:

The designed metasurface functions as a polarization beam splitter for linearly polarized light at 633 nm.
Experimental polarization contrast ratio reached up to 40 dB near the design wavelength and >20 dB across 550-650 nm.
Diffraction efficiency exceeded 10% experimentally (>20% in simulations) at 633 nm, with TE polarization outperforming TM polarization.

Conclusions:

Metasurfaces leveraging third-order GSP resonance are effective for polarization beam splitting in the visible spectrum.
The use of larger nanobricks associated with third-order resonance simplifies fabrication challenges.
The demonstrated approach shows promise for polarization-controlled light steering and other metasurface applications.