Research on high sensing performance and multi-band terahertz tunable perfect absorption device

Area of Science:

• Terahertz (THz) technology
• Plasmonics
• Metamaterials

Background:

• Terahertz (THz) waves are crucial for various applications.
• Developing efficient and tunable THz absorbers is essential.
• Existing devices often lack high performance or tunability.

Purpose of the Study:

• To propose a novel multi-band terahertz tunable perfect absorption device.
• To achieve high detection performance for sensing applications.
• To investigate the underlying physical mechanisms of absorption.

Main Methods:

• Fabrication of a device with AlCuFe microstructure, SiO2 dielectric layer, and Au substrate.
• Analysis of absorption spectra and identification of resonance peaks (M1-M7).
• Investigation of tunability through structural parameters and Fermi level adjustments.

Main Results:

• Achieved an average absorption rate of 98.4% across seven resonance peaks.
• Demonstrated polarization-independent characteristics due to axisymmetric design.
• Exhibited excellent tunability and high performance metrics: sensitivity (3704 GHz RIU⁻¹), Q-factor (315.59), and FOM (66.59 RIU⁻¹).

Conclusions:

• The proposed device offers a simple structure with superior multi-band perfect absorption.
• Synergistic effects of Cavity Resonance (CR), Guided Mode Resonance (GMR), and Localized Surface Plasmon Resonance (LSPR) enhance absorption.
• The device shows significant potential for biomedical sensing, communication, and optoelectronic applications.