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Compact quasi-optical mode converter based on anisotropic metasurfaces
Optics Express
|June 22, 2021
Summary
Researchers developed a compact quasi-optical mode converter using anisotropic metasurfaces. This device efficiently converts terahertz electronic device modes into Gaussian beams with high purity and circular polarization.
Area of Science:
- Metasurfaces and Nanophotonics
- Terahertz (THz) Technology
- Electromagnetic Wave Manipulation
Background:
- High-order mode converters are crucial for advanced electronic devices.
- Existing converters often lack compactness and efficiency.
- Metasurfaces offer novel solutions for wave manipulation at sub-wavelength scales.
Purpose of the Study:
- To present a novel compact quasi-optical mode converter.
- To utilize anisotropic metasurfaces for efficient mode conversion.
- To demonstrate the converter's capability for high-order modes in THz devices.
Main Methods:
- Design and simulation of a Ka-band metasurface quasi-optical mode converter.
- Fabrication of the designed metasurface structure.
- Experimental validation of electromagnetic performance and mode conversion efficiency.
Main Results:
- Successful conversion of cylindrical waveguide TE01 mode to a circularly polarized Gaussian beam.
- Observed Gaussian beam generation over a bandwidth of 35–38 GHz (8.5% bandwidth).
- Achieved maximum scalar Gaussian mode content of 97.85% experimentally.
- Output radiation demonstrated approximate circular polarization.
Conclusions:
- The developed metasurface quasi-optical mode converter is compact and efficient.
- Anisotropic metasurfaces show significant potential for THz electronic devices.
- This technology enables high-purity Gaussian beam generation for advanced applications.
