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Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
Published on: July 24, 2015
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Multifunction and switchable hybrid metasurface based on graphene and gold
Applied Optics
|June 10, 2024
Summary
This study introduces a graphene metasurface for tunable terahertz (THz) absorption and polarization conversion. The device offers ultrawideband absorption and multiband cross-polarization conversion, with potential applications in advanced THz technologies.
Area of Science:
- Metasurfaces
- Terahertz (THz) Technology
- Graphene-based Devices
Background:
- Terahertz (THz) technology requires advanced components for manipulation of electromagnetic waves.
- Graphene's unique electrostatic properties offer potential for tunable metasurface applications.
- Switchable devices are crucial for dynamic control in THz systems.
Purpose of the Study:
- To design and numerically investigate a graphene-based switchable metasurface.
- To achieve ultrawideband absorption and multiband cross-polarization conversion.
- To explore the device's potential for THz applications.
Main Methods:
- Numerical investigation of a graphene-based metasurface design.
- Utilizing graphene's electrostatic tunability to switch between absorption and reflection modes.
- Analysis of absorption and polarization conversion ratios using multiple reflection theory.
Main Results:
- Achieved ultrawideband absorption with a 152% bandwidth ratio from 1.04-7.74 THz.
- Demonstrated multiband cross-polarization conversion for linear and circular waves (1.8-2.5 THz, 3.5-4.1 THz, 5.6 THz).
- Confirmed linear-to-circular conversion at specific frequencies (2.64, 3.45, 5.4 THz) with good agreement between simulations and theory.
Conclusions:
- The designed graphene metasurface offers switchable functionality for THz applications.
- The device shows significant potential for ultrawideband absorption and multiband polarization conversion.
- Applications include stealth technology, smart switches, and other advanced THz systems.
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