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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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Graphene and Vanadium Dioxide-Based Terahertz Absorber with Switchable Multifunctionality for Band Selection
Yan Liu1, Lingxi Hu2, Ming Liu1
1School of Microelectronics, Shenzhen Institute of Information Technology, Shenzhen 518172, China.
Nanomaterials (Basel, Switzerland)
|July 26, 2024
Summary
This study introduces a novel terahertz absorber using vanadium dioxide and graphene. It functions as a tunable band selector, offering flexible control over broadband or narrowband absorption for advanced THz applications.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Nanotechnology
Background:
- Terahertz (THz) technology requires advanced materials for efficient manipulation of THz waves.
- Vanadium dioxide (VO2) exhibits phase transitions, enabling tunable optical properties.
- Graphene offers tunable electronic properties via electrical gating, crucial for device control.
Purpose of the Study:
- To propose and demonstrate a multifunctional absorber in the terahertz (THz) regime.
- To utilize vanadium dioxide (VO2) and graphene for tunable absorption characteristics.
- To explore applications as an either-or band selector in the THz spectrum.
Main Methods:
- Fabrication of a THz absorber incorporating VO2 and graphene layers.
- Electrical and thermal control of the Fermi energy level in graphene and VO2, respectively.
- Numerical simulations to analyze absorption spectra under varying conditions.
Main Results:
- Achieved broadband absorption (>90%) with VO2 in metallic phase and specific graphene Fermi levels.
- Demonstrated double narrowband absorption with VO2 in insulating phase and tailored graphene Fermi levels.
- Showcased flexible switching between broadband and double narrowband absorption, enabling band selection functionality.
Conclusions:
- The proposed VO2-graphene absorber acts as a versatile multifunctional device.
- It can be employed as an electrically and thermally tunable either-or band selector in the THz range.
- Potential applications include THz switches, cloaking devices, and advanced band selectors.
