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Updated: Aug 3, 2025
11:10
Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model
Published on: May 23, 2018
12.0K
Photothermal Effect and Phase Transition in VO2 Enhanced by Plasmonic Particles
Vladimir Kaydashev1, Boris Khlebtsov2, Maxim Kutepov1
1Laboratory of Nanomaterials, Southern Federal University, 200/1 Stachki Ave., 344090 Rostov-on-Don, Russia.
Materials (Basel, Switzerland)
|April 13, 2023
Summary
Researchers developed a new surface acoustic wave (SAW) method to precisely measure temperature and conductivity changes in hybrid gold nanoparticle-vanadium dioxide (VO2) films. This technique enhances the development of advanced optical devices like metasurfaces.
Area of Science:
- Physics
- Materials Science
- Nanotechnology
Background:
- Phase change metasurfaces utilizing vanadium dioxide (VO2) are crucial for programmed Terahertz (THz)/middle Infrared (IR) flat optics.
- Gold nanoparticles (Au NPs) exhibit significant near-IR absorption and photothermal effects, enhancing VO2 switching.
Purpose of the Study:
- To introduce a novel method for simultaneously probing temperature and electrical conductivity in hybrid Au-VO2 composites.
- To characterize laser-induced photothermal effects in Au nanostar/VO2/TiO2/LiNbO3 composites.
Main Methods:
- Utilizing surface acoustic waves (SAW) on a YX128° cut LiNbO3 substrate to monitor phase shifts and attenuation.
- Employing laser-induced photothermal effects to trigger insulator-metal transitions in the composite material.
- Characterizing Au nanostars (AuNSts) with varying surface coverage and a monolayer of 10 nm Au nanoparticles.
Main Results:
- Achieved a temperature resolution of 0.1 °C, comparable to state-of-the-art techniques.
- Demonstrated an optically triggered insulator-metal transition in AuNSts/VO2/TiO2/LiNbO3 composites.
- Investigated photothermal effects at varied light power levels.
Conclusions:
- The proposed SAW-based method is vital for characterizing and optimizing metasurface elements.
- This technique supports the advancement of devices for lab-on-chip and optical communication/processor technologies.
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