Fast photorefractive response in polymeric composites enabled by the control of chromophore free volume

Jongwan Choi; Jong-Sik Moon; Felix Sunjoo Kim; Jin-Woo Oh

doi:10.1364/OL.43.003289

Optics Letters
Vol. 43,
Issue 14,
pp. 3289-3292
(2018)
•https://doi.org/10.1364/OL.43.003289

Fast photorefractive response in polymeric composites enabled by the control of chromophore free volume

Jongwan Choi, Jong-Sik Moon, Felix Sunjoo Kim, and Jin-Woo Oh

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Jongwan Choi, Jong-Sik Moon, Felix Sunjoo Kim, and Jin-Woo Oh, "Fast photorefractive response in polymeric composites enabled by the control of chromophore free volume," Opt. Lett. 43, 3289-3292 (2018)

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Abstract

The molecular orientation of a chromophore importantly affects the electro-optic characteristics of polymeric photorefractive composites. We designed methyl, ethyl, and isopropyl derivatives of 4-piperidinobenzylidene-malononitrile (PDCST) with the aim of enhancing molecular orientation properties, and investigated the effects of alkyl substitution on the electro-optic properties and response times of polymeric photorefractive composites. The three alkyl-substituted PDCSTs showed enhanced electro-optic responses and photorefractive grating buildup rates.

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Chromophore	Volume [ $Å^{3}$ ]	$μ$ [ $10^{- 30} C \cdot m$ ]	$Δ α$ [ $10^{- 40} C \cdot m^{2} \cdot V^{- 1}$ ]	$F_{kerr}$ [ $10^{- 77} C^{2} \cdot m^{4} \cdot mol \cdot V^{- 1} \cdot {kg}^{- 1}$ ]
PDCST	233.16	26.86	12.72	20.80
$m$ -PDCST	258.64	23.76	11.51	13.22
$e$ -PDCST	290.88	23.80	11.53	12.01
$i p$ -PDCST	333.30	22.49	11.69	9.12

PR Composites	$τ_{EO}$ ^a [s]		$τ_{PR}$ ^b [s]		$T_{g}$ [°C]
PR Composites	at $T_{g}$	at 30°C	at $T_{g}$	at 30°C	$T_{g}$ [°C]
$PSX - Cz ∶ PDCST ∶ TNF = 69 ∶ 30 ∶ 1$	40.8	4.49	10.7	2.98	25
$PSX - Cz ∶ m - PDCST ∶ TNF = 69 ∶ 30 ∶ 1$	12.0	0.93	3.10	0.97	24
$PSX - Cz ∶ e - PDCST ∶ TNF = 69 ∶ 30 ∶ 1$	0.98	0.20	2.09	0.99	27
$PSX - Cz ∶ i p - PDCST ∶ TNF = 69 ∶ 30 ∶ 1$	0.34	0.26	0.85	0.72	29

Chromophore	Volume [ $Å^{3}$ ]	$μ$ [ $10^{- 30} C \cdot m$ ]	$Δ α$ [ $10^{- 40} C \cdot m^{2} \cdot V^{- 1}$ ]	$F_{kerr}$ [ $10^{- 77} C^{2} \cdot m^{4} \cdot mol \cdot V^{- 1} \cdot {kg}^{- 1}$ ]
PDCST	233.16	26.86	12.72	20.80
$m$ -PDCST	258.64	23.76	11.51	13.22
$e$ -PDCST	290.88	23.80	11.53	12.01
$i p$ -PDCST	333.30	22.49	11.69	9.12

PR Composites	$τ_{EO}$ ^a [s]		$τ_{PR}$ ^b [s]		$T_{g}$ [°C]
PR Composites	at $T_{g}$	at 30°C	at $T_{g}$	at 30°C	$T_{g}$ [°C]
$PSX - Cz ∶ PDCST ∶ TNF = 69 ∶ 30 ∶ 1$	40.8	4.49	10.7	2.98	25
$PSX - Cz ∶ m - PDCST ∶ TNF = 69 ∶ 30 ∶ 1$	12.0	0.93	3.10	0.97	24
$PSX - Cz ∶ e - PDCST ∶ TNF = 69 ∶ 30 ∶ 1$	0.98	0.20	2.09	0.99	27
$PSX - Cz ∶ i p - PDCST ∶ TNF = 69 ∶ 30 ∶ 1$	0.34	0.26	0.85	0.72	29

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Optics Letters