Broad spectrum measurement of the birefringence of an isothiocyanate based liquid crystal

Oksana Trushkevych; Huan Xu; Tianxin Lu; J. Axel Zeitler; Rakchanok Rungsawang; Felix Gölden; Neil Collings; William A. Crossland

doi:10.1364/AO.49.005212

Applied Optics
Vol. 49,
Issue 28,
pp. 5212-5216
(2010)
•https://doi.org/10.1364/AO.49.005212

Broad spectrum measurement of the birefringence of an isothiocyanate based liquid crystal

Oksana Trushkevych, Huan Xu, Tianxin Lu, J. Axel Zeitler, Rakchanok Rungsawang, Felix Gölden, Neil Collings, and William A. Crossland

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Oksana Trushkevych, Huan Xu, Tianxin Lu, J. Axel Zeitler, Rakchanok Rungsawang, Felix Gölden, Neil Collings, and William A. Crossland, "Broad spectrum measurement of the birefringence of an isothiocyanate based liquid crystal," Appl. Opt. 49, 5212-5216 (2010)

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Abstract

Tunable materials with high anisotropy of refractive index and low loss are of particular interest in the microwave and terahertz range. Nematic liquid crystals are highly sensitive to electric and magnetic fields and may be designed to have particularly high birefringence. In this paper we investigate birefringence and absorption losses in an isothiocyanate based liquid crystal (designed for high anisotropy) in a broad range of the electromagnetic spectrum, namely $0.1 - 4 GHz$ , $30 GHz$ , $0.5 - 1.8 THz$ , and in the visible and near-infrared region ( $400 nm - 1600 nm$ ). We report high birefringence ( $Δ n = 0.19 - 0.395$ ) and low loss in this material. This is attractive for tunable microwave and terahertz device applications.

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Frequency/ Wavelength	$n_{⊥}$	$n_{∥}$	$α_{⊥}$	$α_{∥}$	$Δ n$
$f = 3 GHz$	$1.51 \pm 0.02$	$1.76 \pm 0.03$	$0.08 {cm}^{- 1}$	$0.05 {cm}^{- 1}$	$0.25 \pm 0.05$
$f = 30 GHz$	$1.487 \pm 0.005$	$1.882 \pm 0.005$	$0.25 {cm}^{- 1}$	$0.18 {cm}^{- 1}$	$0.39 \pm 0.01$
$f = 1 THz$	$1.62 \pm 0.02$	$1.83 \pm 0.03$	$23 {cm}^{- 1}$	$23 {cm}^{- 1}$	$0.21 \pm 0.05$
$f = 1.5 THz$	$1.54 \pm 0.02$	$1.83 \pm 0.03$	$49 {cm}^{- 1}$	$10 {cm}^{- 1}$	$0.29 \pm 0.05$
$f = 1.8 THz$	$1.51 \pm 0.02$	$1.84 \pm 0.03$	$35 {cm}^{- 1}$	$2 {cm}^{- 1}$	$0.33 \pm 0.05$
$λ = 1550 nm$	-	-	$13 {cm}^{- 1}$	$40 {cm}^{- 1}$	$0.32 \pm 0.01$
$λ = 800 nm$	-	-	$12 {cm}^{- 1}$	$36 {cm}^{- 1}$	$0.34 \pm 0.01$
$λ = 633 nm$	-	-	$20 {cm}^{- 1}$	$30 {cm}^{- 1}$	$0.37 \pm 0.01$
$λ = 633 nm$	1.535 ^a	1.915 ^a	-	-	0.380 ^a

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Applied Optics