Non-linear optical effects in layer-by-layer alternate films of polycations and an azobenzene-containing polyanion

Lvov, Yuri; Yamada, S.; Kunitake, Toyoki

doi:10.1016/s0040-6090(96)09494-1

Cited by 171 publications

(150 citation statements)

References 28 publications

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“…19 Similar results were reported for films consisting of up to six bilayers made with a quaternary polyamine and the anionic azobenzene-containing polymer that is the focus of the present work. 20 Another study showed a linear increase in absorbance up to at least 80 bilayers; however, the SHG failed to show quadratic scaling above 50 bilayers. 21 The effect of polycation type-branched poly͑ethyleneimine͒ and linear poly͑diallyldimethylammonium chloride͒-on the orientation of the azo group in polycation/poly͕1-͓p-͑3Ј-carboxy-4Ј-hydroxyphenylazo͒benzenesulfonamido͔-1,2-ethandiyl͖ ͑PCBS͒ LbL films was studied using absorbance measurements although NLO effects were not probed.…”

Section: Introductionmentioning

confidence: 99%

Polar orientation of a pendant anionic chromophore in thick layer-by-layer self-assembled polymeric films

Garg¹,

Davis²,

Durak³

et al. 2008

Journal of Applied Physics

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Articles you may be interested inMultilayer films with up to 600 bilayers and 740 nm thickness were fabricated using the alternating deposition of poly͑allylamine hydrochloride͒ and poly͕1-͓p-͑3Ј-carboxy-4Ј-hydroxyphenylazo͒benzenesulfonamido͔-1,2-ethandiyl͖ on glass substrates. Linear relationships for absorbance, thickness, and the square root of the second harmonic intensity versus the number of bilayers demonstrates that the films have long range polar order and optical homogeneity. The deposition conditions ͑i.e., pH of the solutions, solvent quality, deposition and rinsing times͒ are critical variables in fabricating layer-by-layer thick films that exhibit long range polar orientation of chromophores. The ability to fabricate noncentrosymmetric films on the order of a micron thick with bulk second order nonlinear optical responses is crucial because it enables the development of nonlinear optical waveguide devices such as electro-optic modulators.

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Section: Introductionmentioning

confidence: 99%

Polar orientation of a pendant anionic chromophore in thick layer-by-layer self-assembled polymeric films

Garg¹,

Davis²,

Durak³

et al. 2008

Journal of Applied Physics

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show abstract

“…Two observations of second-harmonic generation in films fabricated using the ISAM technique have been recently reported. Lvov et al 19 found that the secondharmonic intensity began to decrease after just four bilayers. Wang et al 20 only report SHG data for a film with five bilayers and do not discuss the dependence of the secondharmonic intensity on the sample thickness.…”

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confidence: 99%

Thickness dependence of second-harmonic generation in thin films fabricated from ionically self-assembled monolayers

Heflin

Figura

Marciu

et al. 1999

Applied Physics Letters

105

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“…Due to the thermal and temporal-dependent relaxation of chromophore alignment in conventional electric field-poled guest-host nonlinear optical polymer materials, the development of alternative techniques to form such materials without the need for electric field poling has been investigated. These techniques include the electrostatically self-assembly method by means of alternate adsorption of polycation and polyanion to build multilayer thin films on solid substrate [8,9], fabricating NLO superlattices by self-assembling via covalent linking [10], and the Langmuir method to prepare monolayers at the air-water interface [11], which provide new possibilities to fabricate NLO thin films without poling by an external electric field.…”

Section: Open Accessmentioning

confidence: 99%

Investigation of Second-Harmonic Generation and Molecular Orientation in Electrostatically Self-Assembled Thin Films

Zhang

Cui

2011

Polymers

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Abstract:We report the observation and measurement of second-harmonic generation in self-assembled ultra thin film nonlinear optical materials using a femtosecond high repetition rate laser system. Second-harmonic intensity, as a function of the incident angle in these films, has been measured using incident p-polarized and s-polarized optical beam components. The second-order nonlinear optical susceptibilities of the thin films have also been determined. Using a curve fitting method and a crystal reference material, we have obtained second-order susceptibilities χ 333 = 6.17 ± 0.18 pm/V and χ 311 = 0.68 ± 0.02 pm/V at a fundamental wavelength of 1,200 nm. Based on linear molecular model approximation, we have also used the fitted data to investigate the average orientation distribution of the chromophore dipoles in the self-assembled film. The result indicates that the average tilt angle of the chromophore dipoles away from the substrate normal line is 25.2° ± 0.8°.

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Non-linear optical effects in layer-by-layer alternate films of polycations and an azobenzene-containing polyanion

Cited by 171 publications

References 28 publications

Polar orientation of a pendant anionic chromophore in thick layer-by-layer self-assembled polymeric films

Polar orientation of a pendant anionic chromophore in thick layer-by-layer self-assembled polymeric films

Thickness dependence of second-harmonic generation in thin films fabricated from ionically self-assembled monolayers

Investigation of Second-Harmonic Generation and Molecular Orientation in Electrostatically Self-Assembled Thin Films

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