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Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

282
Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
282

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Related Experiment Video

Updated: Jul 20, 2025

Fabrication of Nanopillar-Based Split Ring Resonators for Displacement Current Mediated Resonances in Terahertz Metamaterials
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A Metasurface-Based LTC Polarization Converter with S-Shaped Split Ring Resonator Structure for Flexible

Erfeng Li1, Xue Jun Li1, Boon-Chong Seet1

  • 1Department of Electrical and Electronic Engineering, Auckland University of Technology, Auckland 1010, New Zealand.

Sensors (Basel, Switzerland)
|July 29, 2023
PubMed
Summary

This study introduces a flexible metasurface converter for transforming linear polarization to circular polarization. The novel design demonstrates high efficiency for conformal and wearable electronic applications.

Keywords:
L2C polarization converterflexiblemetasurfacesplit ring resonator

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Area of Science:

  • Electromagnetics and Metamaterials
  • Applied Physics
  • Microwave Engineering

Background:

  • Metasurfaces offer unique electromagnetic properties for wave manipulation.
  • Linear-to-circular polarization conversion is crucial for advanced antenna and communication systems.
  • Flexible metasurfaces are needed for conformal and wearable device integration.

Purpose of the Study:

  • To design and demonstrate a flexible metasurface-based linear-to-circular polarization converter.
  • To achieve high polarization conversion efficiency at microwave frequencies.
  • To evaluate the performance of the converter under conformal conditions.

Main Methods:

  • A metasurface unit cell composed of nested S- and C-shaped split ring resonators was designed.
  • Electromagnetic simulations were performed to analyze the converter's performance.
  • Conformal tests were conducted by applying the metasurface to curved surfaces.

Main Results:

  • The proposed metasurface effectively converts linearly polarized waves to left-handed circularly polarized waves at 12.4 GHz.
  • High polarization conversion rate and efficiency were achieved at the target frequency.
  • Conformal tests showed a minor shift in operating frequency on a sinusoidal wavy surface, indicating good flexibility.

Conclusions:

  • The flexible metasurface-based polarization converter is suitable for conformal and wearable applications.
  • The nested split ring resonator design provides efficient polarization conversion.
  • The device exhibits robustness to moderate surface curvature.