Two-dimensional poling of organic and polymer films for improved nonlinear-optical properties

Shlomo Yitzchaik; Garry Berkovic; Valeri Krongauz

doi:10.1364/OL.15.001120

Optics Letters
Vol. 15,
Issue 20,
pp. 1120-1122
(1990)
•https://doi.org/10.1364/OL.15.001120

Two-dimensional poling of organic and polymer films for improved nonlinear-optical properties

Shlomo Yitzchaik, Garry Berkovic, and Valeri Krongauz

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Shlomo Yitzchaik, Garry Berkovic, and Valeri Krongauz, "Two-dimensional poling of organic and polymer films for improved nonlinear-optical properties," Opt. Lett. 15, 1120-1122 (1990)

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Abstract

Nematic films doped with molecules of high nonlinear polarizability can exhibit two-dimensional asymmetry after electric-field poling along one direction only. Consequently, these films exhibit more nonzero components of the second-order susceptibility tensor than are obtained through usual poling techniques. These films can exhibit very high nonlinear optical coefficients (close to 10⁻⁷ esu/cm³) and retain most of their nonlinearity one week after removal of the poling field.

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Sample	T₈ (°C)	Field (V/cm)	$χ_{xxx}^{(2)} (10^{- 9} esu / {cm}^{3})$	$χ_{zzz}^{(2)} (10^{- 9} esu / {cm}^{3})$
20% QLC/80% PLCP(1)	45	0	0.1	<0.02
20% QLC/80% PLCP(1)		1 × 10⁴	0.2	2
2% DANS/98% LCP(1)	35	0	<0.02	<0.02
2% DANS/98% LCP(1)		1 × 10⁴	1	2.6
20% QLC/80% PLCP(3)	57	0	0.08	4.4
20% QLC/80% PLCP(3)		1 × 10⁴	0.3	5.2
10% MBANS/90% QLC	54	0	0.03	1.5
10% MBANS/90% QLC		1 × 10⁴	0.2	2.6
20% QLC/80% PLCP(2)	30	0	<0.02	0.06
20% QLC/80% PLCP(2)		5 × 10⁴	2	44
2% DANS/23% QLC/75% PLCP(1)	47	0	<0.02	0.2
2% DANS/23% QLC/75% PLCP(1)		5 × 10⁴	5	60

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Optics Letters