Multi-functional device: manipulating linear and circular-polarization conversion in a terahertz chiral metamaterial.

Area of Science:

• Physics
• Materials Science
• Electrical Engineering

Background:

• Chiral metamaterials offer unique ways to control electromagnetic waves.
• Terahertz (THz) technology requires advanced devices for wave manipulation.

Purpose of the Study:

• To propose a multi-functional terahertz chiral metamaterial.
• To investigate its capabilities in manipulating polarized waves, including asymmetric transmission, polarization conversion, and circular dichroism.

Main Methods:

• Theoretical proposal and simulation of a terahertz chiral metamaterial.
• Analysis of transmission and reflection properties for linear and circular polarized waves.

Main Results:

• Dual-band asymmetric transmission of linear polarized waves at 0.42 THz and 1.04 THz (peak factors ~0.51 and ~0.55).
• Intense linear-to-elliptical polarization conversion at 0.81 THz and 0.97 THz.
• Strong circular dichroism (parameter ~0.64) and asymmetric reflection (factor ~0.55) for circular polarized waves at 0.36 THz.

Conclusions:

• The proposed terahertz chiral metamaterial acts as a versatile device for manipulating polarized waves.
• It exhibits distinct functionalities including asymmetric transmission, polarization conversion, and circular dichroism in the terahertz regime.