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Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals

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Published on: August 15, 2018

Polarizing terahertz waves with nematic liquid crystals.

Cho-Fan Hsieh¹, Yu-Chien Lai, Ru-Pin Pan

¹Department of Electrophysics National Chiao Tung University, Hsinchu, Taiwan.

|June 3, 2008

Summary

A novel terahertz polarizer using a nematic liquid crystal (NLC) layer achieved high performance. This device offers excellent polarization factor and extinction ratio for terahertz applications.

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Area of Science:

Optics and Photonics
Materials Science

Background:

Terahertz (THz) wave applications require efficient polarization control.
Existing THz polarizers face challenges in performance and tunability.

Purpose of the Study:

To demonstrate a Feussner-type terahertz polarizer utilizing a nematic liquid crystal (NLC) layer.
To evaluate the polarization factor and extinction ratio of the NLC-based polarizer.

Main Methods:

Fabrication of a Feussner-type polarizer incorporating an NLC layer sandwiched between fused-silica prisms.
Characterization of the polarizer's performance in the terahertz frequency range.

Main Results:

The NLC-based terahertz polarizer demonstrated a polarization factor exceeding 0.99.
An extinction ratio greater than 10(-5) was achieved, indicating high-quality polarization.

Conclusions:

The developed NLC-based terahertz polarizer offers superior performance.
This device presents a promising solution for terahertz wave polarization control.