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Related Experiment Video

Updated: Sep 12, 2025

Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model

Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model

Published on: May 23, 2018

Switchable linear to circular polarization conversion in reflection and transmission modes based on vanadium-dioxide.

Eman M Eldesouki¹, Ahmed Elsayed Abouelez²

¹Microwave Engineering Department, Electronics Research Institute (ERI), Cairo, Egypt. eman@eri.sci.eg.

Scientific Reports

|August 6, 2025

Summary

This study presents a switchable dual-mode linear-to-circular polarization converter (LTC-PC) using vanadium dioxide (VO2) for terahertz (THz) applications. The device operates in transmission or reflection modes, offering versatile polarization conversion for THz communication systems and sensors.

Keywords:

Dual mode Metamaterials Polarization converter Terahertz Vanadium dioxide

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Published on: May 13, 2020

Area of Science:

Electromagnetics and Optics
Materials Science
Nanotechnology

Background:

Terahertz (THz) technology requires efficient polarization control components.
Vanadium dioxide (VO2) exhibits tunable phase transitions, making it suitable for dynamic electromagnetic devices.
Developing switchable polarization converters is crucial for advanced THz systems.

Purpose of the Study:

To design and demonstrate a switchable dual-mode linear-to-circular polarization converter (LTC-PC) in the THz band.
To enable the converter to operate in both transmission and reflection modes by tuning the state of VO2.
To achieve high performance in terms of axial ratio and polarization conversion efficiency.

Main Methods:

Utilizing vanadium dioxide (VO2) as the active material for mode switching.
Investigating the device's performance in insulating (transmission mode) and metallic (reflection mode) states of VO2.
Analyzing surface current distributions and polarization ellipses to understand conversion mechanisms.

Main Results:

The converter operates in transmission mode with LTC polarization conversion between 1.26-1.47 THz and 1.83-1.85 THz, and at 1.7 THz.
In reflection mode, circular polarization conversion is achieved within 0.93-1.67 THz and 1.80-1.86 THz.
The dual-mode converter demonstrates axial ratios below 3 dB and polarization conversion efficiency greater than 0.8.

Conclusions:

The proposed VO2-based LTC-PC offers high performance and dual functionality.
The switchable nature of the converter allows for flexible operation in THz systems.
This design holds potential for applications in THz communication and sensing technologies.