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Evaluating liquid crystal properties for use in terahertz devices.
Hongkyu Park1, Edward P J Parrott, Fan Fan
1Department of Electrical and Computer Engineering, The Hong Kong University of Science and Technology, Clearwater Bay, Hong Kong.
Optics Express
|June 21, 2012
Summary
Terahertz properties of liquid crystals (LCs) were investigated. RDP-94990 showed the best performance with high birefringence and low absorption for terahertz applications.
Area of Science:
- Optics and Photonics
- Materials Science
Background:
- Liquid crystals (LCs) are widely used in the visible spectrum.
- Their terahertz (THz) properties remain underexplored.
Purpose of the Study:
- Investigate THz properties of specific LCs (E7, BL037, RDP-94990, RDP-97304).
- Identify LCs suitable for THz device applications.
Main Methods:
- Terahertz time-domain-spectroscopy (THz-TDS).
- Characterization of birefringence and absorption spectra.
Main Results:
- RDP-94990 exhibits the highest birefringence in the THz range.
- RDP-94990 demonstrates the lowest absorption compared to E7 and BL037.
- Significant variations in THz properties among the tested LCs.
Conclusions:
- RDP-94990 is a promising material for THz LC devices.
- Comprehensive parameter evaluation (beyond birefringence) is crucial for designing efficient THz LC devices.
