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Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model
Published on: May 23, 2018
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An active tunable terahertz functional metamaterial based on hybrid-graphene vanadium dioxide
1School of Microelectronics and Control Engineering, Changzhou University, Changzhou 213164, China. btang@cczu.edu.cn.
Physical Chemistry Chemical Physics : PCCP
|March 1, 2023
Summary
This study introduces a novel hybrid metamaterial device using graphene and vanadium dioxide (VO2). This device offers switchable and tunable circular dichroism and dual-band perfect absorption in the terahertz spectrum.
Area of Science:
- Metamaterials
- Terahertz Technology
- Condensed Matter Physics
Background:
- Vanadium dioxide (VO2) exhibits a metal-insulator transition.
- Graphene offers tunable electronic properties.
- Terahertz (THz) applications require advanced functional materials.
Purpose of the Study:
- To propose a switchable and tunable metamaterial device.
- To achieve circular dichroism (CD) and dual-band perfect absorption in the THz region.
- To explore the device's potential for versatile functional applications.
Main Methods:
- Hybrid metamaterial design incorporating graphene and VO2.
- Utilizing the metal-insulator transition of VO2 for switching.
- Analysis using electric field distribution and coupled mode theory.
Main Results:
- Achieved polarization-selective single-band perfect absorption with strong CD (max 0.84) in the insulator state of VO2.
- Demonstrated tunable dual-band perfect absorption when VO2 is in the metallic state.
- Investigated the impact of graphene's Fermi energy and geometric parameters on spectral responses.
Conclusions:
- The proposed hybrid metamaterial device exhibits switchable and tunable functionalities.
- It enables distinct optical responses (CD and dual-band absorption) in the THz range.
- Provides a platform for developing advanced THz functional devices.
