Symmetric left-handed split ring resonator metamaterial design for terahertz frequency applications

Area of Science:

• Metamaterials
• Terahertz Technology
• Nanophotonics

Background:

• Terahertz (THz) frequency applications require advanced metamaterial designs.
• Compact and efficient metamaterials are crucial for developing novel THz devices.
• Silicon is a suitable substrate for fabricating micro-scale metamaterials.

Purpose of the Study:

• To propose and investigate novel symmetrical left-handed split ring resonator metamaterials.
• To explore the terahertz frequency response of these metamaterials.
• To analyze the effects of structural modifications on metamaterial performance.

Main Methods:

• Fabrication of metamaterials on a 5 µm silicon substrate.
• Simulation using High-frequency Structure Simulator (HFSS) and Advanced Design System (ADS).
• Parameter studies including rotation, array/layer design, scaling, and electric field analysis.

Main Results:

• Two square-shaped metamaterial designs exhibited single and double resonance frequencies at 3.03 THz and 3.32/9.24 THz, respectively.
• Simulations showed discrepancies less than 5% compared to verification.
• Resonance frequencies were tunable via clockwise rotation and size scaling, with larger designs yielding over nine resonances.
• Absorption performances showed four and five peak points for the unit cell designs.

Conclusions:

• The proposed metamaterials demonstrate tunable responses and acceptable absorption for terahertz applications.
• Structural modifications offer effective control over the metamaterial's electromagnetic behavior.
• These compact, novel designs present a promising platform for terahertz frequency applications.