Actively Tunable "Single Peak/Broadband" Absorbent, Highly Sensitive Terahertz Smart Device Based on VO₂

Area of Science:

• Physics
• Materials Science
• Electrical Engineering

Background:

• Terahertz (THz) technology development requires tunable devices beyond traditional fixed-functionality components.
• Existing THz devices often use non-adjustable metal materials, limiting their versatility and practical applications.
• Vanadium dioxide (VO2) exhibits temperature-dependent phase transitions, offering potential for dynamic THz device control.

Purpose of the Study:

• To design a versatile THz intelligent absorber by integrating metamaterials with phase change materials.
• To achieve flexible switching between multiple functionalities and precise performance tuning using temperature stimulation.
• To enhance the device's process tolerance and environmental adaptability by considering various operational parameters.

Main Methods:

• Innovative combination of metamaterials with the phase change material VO2.
• Leveraging temperature-induced phase transitions for tunable THz absorption.
• Utilizing localized surface plasmon resonance (LSPR) and electric field characterization for analysis.
• Investigating the impact of polarization, temperature, structural parameters, and incident angle.

Main Results:

• Successful design of a THz intelligent absorber with switchable functionalities.
• Demonstration of precise performance tuning through external temperature control.
• Analysis of device performance considering polarization, temperature, structure, and incident angle.
• Validation of the localized surface plasmon resonance (LSPR) principle and local field enhancement.

Conclusions:

• The proposed metamaterial-VO2 absorber offers a novel approach for multi-functional and tunable THz devices.
• The design exhibits excellent process tolerance and environmental adaptability.
• This work provides valuable insights and methods for future THz device development.
• Potential applications include electromagnetic invisibility, shielding, modulation, and detection.