Properties of chosen nematic liquid crystals in 0.1 - 10.0 thz range: Simulations and experimental results (Conference Presentation)

Janusz Parka

doi:10.1117/12.2323611

18 September 2018 Properties of chosen nematic liquid crystals in 0.1 - 10.0 thz range: Simulations and experimental results (Conference Presentation)

Janusz Parka

Author Affiliations +

Proceedings Volume 10735, Liquid Crystals XXII; 1073515 (2018) https://doi.org/10.1117/12.2323611
Event: SPIE Organic Photonics + Electronics, 2018, San Diego, California, United States

Abstract

Liquid crystal materials have interesting properties in Terahertz wave range. Specially 0.3 – 10.0 range is interesting looking from application point of view. The structure and rotational and vibrational oscillations of liquid crystal molecules have influence on physical properties of the material in this frequency range. Chosen liquid crystal materials with dielectric anisotropy parameters (Δε form 0 to more than 30) and optical refractive index (Δn from 0 to about 0.6) in THz range ware investigated. Firstly transmission, absorption and permittivity of chosen liquid crystal molecules were simulate. Influence ofdifferent terminal group like F, CN, NCS and quantity of benzene rings were compared. Relations between structure of molecules and absorption spectra were observed. These parameters were compared with experimental data. Some liquid crystal materials (single compounds and mixtures) obtained in Institute of Chemistry MUT with very high polarization coefficients more that 2000 nC/cm2 and relatively low loss were tested. Significant differences in their dielectric losses and dichroism have been obtained. Refractive indices and absorption parameters were characterized. Acceptable dynamic parameters from application point of view were received. This kind of liquid crystal samples can have application in tunable terahertz devices, like tunable phase shifter and gratings.

Conference Presentation

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Janusz Parka "Properties of chosen nematic liquid crystals in 0.1 - 10.0 thz range: Simulations and experimental results (Conference Presentation)", Proc. SPIE 10735, Liquid Crystals XXII, 1073515 (18 September 2018); https://doi.org/10.1117/12.2323611

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KEYWORDS

Liquid crystals

Terahertz radiation

Absorption

Molecules

Dielectrics

Refractive index

Anisotropy

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