Adjustable Trifunctional Mid-Infrared Metamaterial Absorber Based on Phase Transition Material VO₂

Area of Science:

• Metamaterials and Nanophotonics
• Condensed Matter Physics

Background:

• Metamaterial absorbers are crucial for various optical applications.
• Phase transition materials offer dynamic control over material properties.
• Vanadium dioxide (VO2) exhibits a significant insulator-to-metal transition with temperature changes.

Purpose of the Study:

• To demonstrate an adjustable trifunctional absorber in the mid-infrared domain.
• To achieve tunable broadband, narrowband, and superimposed absorption modes.
• To utilize the phase transition properties of VO2 for dynamic absorption control.

Main Methods:

• Design and fabrication of a metamaterial structure incorporating a VO2 film.
• Modulation of temperature to induce the phase transition in VO2.
• Characterization of absorption spectra under different temperature conditions.

Main Results:

• The absorber demonstrated tunable broadband and narrowband absorption by switching VO2 between metallic and insulating states.
• Superimposed absorption was achieved when VO2 was in the insulating state.
• The impedance matching principle was used to explain the absorption mechanism.

Conclusions:

• The developed VO2-based metamaterial absorber offers trifunctional absorption capabilities.
• The device exhibits promising potential for applications in sensing, radiation thermometry, and switching devices.
• Temperature-driven phase transition in VO2 provides an effective method for dynamic control of optical absorption.