Chromophore-functionalised polymides with high-poling stabilities of the nonlinear optical effect at elevated temperature

Gubbelmans, Elke; Verbiest, Thierry; Beylen, Marcel Van; Persoons, André; Samyn, Celest

doi:10.1016/s0032-3861(01)00678-4

Cited by 45 publications

(28 citation statements)

References 31 publications

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“…The SHG intensity (I abc ) is proportional to a squared modulus of the corresponding Jones c (2) tensor, where a, b, and c can be either s or p polarizations. Relatively weak SHG activity was observed for I sss and I ppp (Figures 2 a and 2 d), but significant SHG activity was observed for both the cross-polarized combinations I spp and I pss (Figures 2 b and 2 c).…”

Section: Resultsmentioning

confidence: 99%

“…[20] Conclusions SHG of DNA assemblies has been characterized both theoretically and experimentally. Within the electric dipole approximation, the intrinsic anti-parallel orientation of double-stranded DNA leaves only the chiral-specific b (2) tensor elements within the polymer frame. Nevertheless, theoretical predictions suggest that DNA can potentially spontaneously assemble into thermodynamically stable structures that demonstrate SHG activity without requiring application of external forces.…”

Section: Resultsmentioning

confidence: 99%

“…The Cartesian c (2) tensor elements summarized in Equations (1) are related to experimental Jones tensor elements c (2) (defined with respect to p and s polarizations where p and s denoted in-plane and out-of-plane polarization relative to the sample, respectively). [22] The Cartesian Y axis is defined parallel to the s polarization vector such that p polarization vector lies within the Cartesian XZ plane (Figure 1).…”

Section: Introductionmentioning

confidence: 99%

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DNA‐Based Polymers as Chiral Templates for Second‐Order Nonlinear Optical Materials

et al. 2009

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The unique symmetry properties of chiral systems allow the emergence of coherent second harmonic generation in polymeric materials lacking polar order. Deoxyribonucleic acid (DNA) treated with the surfactant cetyltrimethylammonium (CTMA) was drop-cast to spontaneously form films that are active for coherent second harmonic generation (SHG). SHG images acquired as a function of incident and exigent polarization are in good agreement with theoretical predictions assuming nonpolar D(infinity) symmetry for the double-stranded DNA chains. Doping the DNA films with crystal violet substantially increases the efficiency of SHG, but does not significantly alter the polarization-dependence, suggesting that the SHG generated upon doping arises from the same chiral-specific origin, presumably templated by the DNA. These results raise the possibility of new design strategies for organic nonlinear optical materials based on soft chiral polymers that do not require polar order.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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DNA‐Based Polymers as Chiral Templates for Second‐Order Nonlinear Optical Materials

et al. 2009

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“…Accordingly, there have been increasing researches in azobenzene containing side-chain and main-chain NLO polymers which have the azobenzene groups covalently bonded within the polymers. [11][12][13][14][15][16][17][18][19] We have recently reported [20][21] the synthesis of a new series of azobenzene-containing side-chain polymers by grafting azobenzene compounds to conjugated polymers and by radical polymerization from the monomers of acrylates containing azobenzene group. [22] Recently, more and more copolymers [23][24][25][26] and even few homopolymers, [27] containing azobenzene side chain are synthesized by the atom transfer radical polymerization (ATRP) technique.…”

Section: Introductionmentioning

confidence: 99%

Atom Transfer Radical Polymerization and Third‐Order Nonlinear Optical Properties of New Azobenzene‐Containing Side‐Chain Polymers

et al. 2007

Macro Chemistry & Physics

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The atom transfer radical polymerization (ATRP) technique has been successfully applied to synthesize a series of nonlinear optically (NLO) active homopolymers, 4‐(4‐nitrophenyl‐diazenyl) phenyl acrylate (P‐NPAPA) and 4‐(4‐methoxyphenyl‐diazenyl) phenyl acrylate (P‐MPAPA), containing azobenzene groups on the side chain. The third‐order NLO properties of the polymer films were measured by the degenerated four‐wave mixing (DFWM) technique. A dependence of the χ(3) values and response times of polymers on their number‐average molecular weight and the electronic effect of the substituent (nitro‐ or methoxy‐) on the azobenzene group have been evidenced. The increasing χ(3) value of the polymer films at the magnitude of about 10−10 was displayed with increasing molecular weight and the presence of the push‐pull electronic system contributes much in enhancing the third‐order NLO susceptibility of polymers.

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“…The polymer containing azobenzene chromophore has been studied for over 70 years, yet it continues to present new and unique optical effects [1][2][3][4] . They have been incorporated into a wide variety of materials and molecular architectures, including polymers and molecular glasses.…”

Section: Introductionmentioning

confidence: 99%

Optically Active Polyurethane Containing Asymmetric Center: Preparation, Characterization and Thermo-Optic Properties

Qiu

Zhang

Liu

et al. 2010

Polymer-Plastics Technology and Engineering

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Optically active azobenzene polyurethane (OAAPU) containing donor-P-acceptor azo group and asymmetric center was obtained from chromophore NABZ, chiral reagent L(-)-tartaric acid and toluene diisocyanate (TDI). The chemical structure and the thermal property were characterized by UV-Vis spectroscopy, FT-IR, 1H NMR and differential scanning calorimeter. The optical switching parameters: refractive indices, thermo-optic coefficients, the dielectric constants and volume expansion coefficients of OAAPU were obtained. The refractive index of OAAPU polymer decreased linearity with the increasing of temperature at the same OAAPU content and had a high thermo-optic coefficient À4.0714-À3.8686Â10 À4 C À1 . The conclusion has a little significance to develop new digital optical switch material.

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Chromophore-functionalised polymides with high-poling stabilities of the nonlinear optical effect at elevated temperature

Cited by 45 publications

References 31 publications

DNA‐Based Polymers as Chiral Templates for Second‐Order Nonlinear Optical Materials

DNA‐Based Polymers as Chiral Templates for Second‐Order Nonlinear Optical Materials

Atom Transfer Radical Polymerization and Third‐Order Nonlinear Optical Properties of New Azobenzene‐Containing Side‐Chain Polymers

Optically Active Polyurethane Containing Asymmetric Center: Preparation, Characterization and Thermo-Optic Properties

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