Reconfigurable and tunable terahertz wrench-shape metamaterial performing programmable characteristic

Area of Science:

• Metamaterials
• Terahertz (THz) technology
• Optical computing

Background:

• Terahertz (THz) waves offer unique properties for advanced applications.
• Programmable devices are crucial for next-generation optical communication and computing.
• Metamaterials provide novel ways to manipulate electromagnetic waves.

Purpose of the Study:

• To design and demonstrate a tunable THz programmable device.
• To explore the electromagnetic response and optical-logic behaviors of wrench-shape metamaterials (WSM).
• To assess the potential of WSM for applications in filters, switches, and all-optical logic devices.

Main Methods:

• Fabrication of a WSM unit cell on a silicon substrate using a gold layer.
• Characterization of the electromagnetic response across a 3.00 to 8.00 THz range.
• Analysis of resonance switching (single-band and dual-band) under different incident angles and WSM configurations.

Main Results:

• The WSM device exhibited switchable single-band and dual-band resonance for transverse electric and magnetic modes.
• Resonance was largely insensitive to incident THz wave angles, with broader bandwidth and decreased transmission at oblique angles.
• Configurable WSM units displayed programmable optical-logic behaviors with anti-interference capabilities.

Conclusions:

• The developed WSM device offers tunable and programmable THz functionalities.
• It is suitable for ultra-narrowband filters, single-/dual-band switches, and polarization switches.
• The technology holds potential for all-optical logic devices with multichannel data processing at higher bit rates.