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Area of Science:

Optics and Photonics
Materials Science
Electromagnetics

Background:

Terahertz (THz) frequency range presents unique challenges for polarization control.
Conventional reflective polarization converters often have fixed, non-tunable responses.
Liquid crystals (LCs) offer a promising platform for dynamic optical manipulation.

Purpose of the Study:

To design and demonstrate an electrically controllable reflective broadband linear polarization (LP) converter.
To achieve efficient cross-polarization conversion (CPC) in the terahertz range.
To enable dynamic control over polarization states via voltage biasing.

Main Methods:

Utilized a novel structure incorporating nematic liquid crystals (LCs).
Employed voltage bias switching to re-orient LC molecules.
Simulated and experimentally validated the device performance in the THz frequency range.

Main Results:

Achieved a high polarization conversion ratio (PCR) > 0.9.
Demonstrated broadband operation from 236.8 to 269.6 GHz.
Showcased dynamic control of cross-polarized and co-polarized reflected waves by switching LC states.

Conclusions:

The proposed electrically controllable LC-based LP converter offers tunable CPC in the THz range.
Dynamic control surpasses limitations of fixed-response converters.
Significant potential for applications in THz imaging and optical communications.