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Tunable beam splitter using bilayer geometric metasurfaces in the visible spectrum
Optics Express
|September 29, 2020
Summary
This study introduces a tunable nanoscale beam splitter using geometric metasurfaces. It precisely controls light splitting angles and energy ratios for various polarizations, enabling advanced optical applications.
Area of Science:
- Optics and Photonics
- Nanotechnology
- Materials Science
Background:
- Metasurfaces offer versatile wavefront manipulation and miniaturization of optical components.
- Traditional optical elements face limitations in size and tunability.
- Geometric metasurfaces provide a platform for advanced optical control.
Purpose of the Study:
- To propose and numerically examine a nanoscale tunable beam splitter.
- To achieve tunable beam splitting in the visible spectrum using bilayer geometric metasurfaces.
- To demonstrate polarization-dependent beam splitting capabilities.
Main Methods:
- Utilizing a bilayer of geometric metasurfaces with opposite quadratic phase distributions.
- Implementing relative lateral displacement between metasurface layers to create tunable linear phase gradients.
- Numerically simulating the device's performance under visible light illumination.
Main Results:
- Precise tunability of beam splitting angles was achieved.
- Effective control over the energy split ratio based on incident polarization ellipticity was demonstrated.
- Opposite phase gradients for orthogonal circularly polarized incidences enabled polarization beam splitting.
Conclusions:
- The proposed nanoscale tunable beam splitter offers precise control over light manipulation.
- This design shows significant potential for applications in optical communication, measurement, and displays.
- Geometric metasurfaces provide a robust platform for developing advanced optical devices.
