Vanadium dioxide based broadband THz metamaterial absorbers with high tunability: simulation study.

Area of Science:

• Metamaterials and Nanophotonics
• Condensed Matter Physics
• Electromagnetics

Background:

• Metamaterials offer unique electromagnetic wave manipulation capabilities, crucial for addressing the "THz gap".
• Vanadium dioxide (VO2) exhibits a significant (three orders of magnitude) increase in terahertz (THz) electrical conductivity during its insulator-to-metal phase transition.

Purpose of the Study:

• To propose and numerically demonstrate a novel VO2-based metamaterial absorber.
• To investigate the broadband absorption properties and their dependence on VO2's THz electrical characteristics.

Main Methods:

• Design of a doubly periodic array of VO2 structures for metamaterial absorber fabrication.
• Numerical simulations to analyze the absorption spectra and electromagnetic response.
• Investigation of the influence of VO2's phase transition on THz absorption.

Main Results:

• The proposed VO2 metamaterial absorber exhibits broadband absorptivity due to multiple resonances.
• Absorption performance is highly sensitive to the THz electrical properties of VO2.
• The insulator-to-metal transition of VO2 dramatically influences the absorption behavior.

Conclusions:

• The designed VO2 metamaterial absorber shows promise for filling the THz gap.
• The demonstrated tunability offers potential for active modulation and switching of broadband THz radiation.