Stability of the functional NLO polymers–optically induced depoling of the DMABI molecules in sPMMA matrix

Vembris, Aivars; Rutkis, Mārtiņš; Zauls, V.; Laizane, Elina

doi:10.1016/j.tsf.2007.11.090

Cited by 8 publications

(5 citation statements)

References 14 publications

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“…The centre of symmetry is necessarily broken when preferred helicity is achieved in supramolecular organization. Polymers of such organized geometry are very interesting since they can supplement the directional order of donor-acceptor p-electron system and the dipole units are tilted in one direction along the polymer axis which leads to high second harmonic generation ability [1][2][3][4]. Optically pure materials which have only left handed/right handed symmetry are inherently non-centrosymmetric [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Isosorbide based chiral polyurethanes: optical and thermal studies

Varkey

Sreekumar

2010

J Mater Sci

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A new class of chiral polyurethanes containing amido linkages in the polymer backbone have been synthesized by reacting toluene diisocyanate with isosorbide (IS) chiral moiety and the chromophores [N,N 0 -ethane-1,2-diyl bis(6-hydroxy hexanamide), N,N 0 -butane-1,4-diyl bis(6-hydroxy hexanamide) and N,N 0 -hexane-1,6-diyl bis (6-hydroxy hexanamide)]. The corresponding chromophores were obtained by the aminolysis of e-caprolactone by using the diamines, diaminoethane, diaminobutane and diaminohexane, respectively. All the polymers were synthesized according to the symmetry conditions so as to obtain the non-centrosymmetric environment. A series of polyurethanes were synthesized by varying the chiralchromophore composition. The polyurethanes developed were characterized by optical and thermal methods.

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Section: Introductionmentioning

confidence: 99%

Isosorbide based chiral polyurethanes: optical and thermal studies

Varkey

Sreekumar

2010

J Mater Sci

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“…The two-electrode corona poling setup described above has been successfully used for practical poling of polymer samples and acquiring NLO active thin films [5][6][7][8][9][10]. At the same time, uncertainty in control of the sample surface charge build-up is typical for a setup of the kind, and, therefore, the poling field strength remains unknown.…”

Section: Resultsmentioning

confidence: 99%

“…The efficiency of corona poling procedure was characterized by measuring the 2 nd harmonic generation (SHG) coefficients of the sample. Description of the experimental setup for SHG measurements and determination of relevant coefficients can be found in [8].…”

Section: Resultsmentioning

confidence: 99%

Chromophore Poling in Thin Films of Organic Glasses. 2. Two-Electrode Corona Discharge Setup

Vilitis¹,

Muzikante²,

Rutkis³

et al. 2012

Latvian Journal of Physics and Technical Sciences

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Chromophore Poling in Thin Films of Organic Glasses. 2. Two-Electrode Corona Discharge Setup In Part 1 of the article we provided description of the corona discharge physics and overview of the methods used for corona poling in thin organic films. Subsequent sections describe comparatively simple technical methods for poling the organic nonlinear optical polymers using a two-electrode (point-to-plate or wire-to-plate) technique. The polarization build-up was studied by the DC positive corona method for poling the nonlinear optical (NLO) polymers. The experimental setup provides the corona discharge current from 0.5 μA up to 3 μA by applying 3 kV - 12 kV voltage to the corona electrode and makes possible selection among the types of corona electrodes (needle, multi-needle, wire, etc.). The results of experimental testing of the poling setup show that at fixed optimal operational parameters of poling - the sample orientation temperature and the discharge current - the corona charging of polymeric materials can successfully be performed applying the two-electrode technique. To study the dynamics of both poling and charge transport processes the three-electrode charging system - a corona triode - should be applied.

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“…To enable the low-cost optical device fabrication opportunity, the already described small organic molecules been either attached to the main or side chain of the polymers 1,[6][7] , or mixed into a polymer matrix creating a "host-guest" system 1,[8][9][10] . However their application is complicated and challenging task as in every attempt to obtain the same polymer it will have different physical properties.…”

Section: Introductionmentioning

confidence: 99%

Thermal, glass-forming, nonlinear optical and holographic properties of "push-pull" type azochromophores with triphenyl moieties containing isophorene and pyranylidene fragments

et al. 2013

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Molecular organic compounds with electron donating fragment bounded through π-conjugated system with electron acceptor fragment, as well as with incorporated triphenyl groups in their molecules show potential for creating cheap and simple solution processable materials with nonlinear optical properties. Additional insertion of azobenzene fragment in their structures makes them also possible to form holographic volume and surface relief gratings (SRG) after exposure to laser radiation, which could be useful for holographic data storage. For these purposes polymers are generally used. However, their application is complicated and challenging task as in every attempt to obtain the same polymer it will have different physical properties. On the other hand, the synthetic procedure of molecular glasses is more simple as their structure and physical properties are strongly defined. Unfortunately, there is still no clear relation between compound organic structures and their thermal, glass-forming and optical properties. In order to investigate the above mentioned regularities, we have synthesized and investigated ten molecular glassy organic compounds with three different fragments as main backbones of the molecules: indene-1,3-dione (WE-1, WE-2, WE-3), isophorene (IWK-1D, IWK-2M, IWK-2D) and pyranylidene (DWK-2TB, ZWK-2TB, JWK-2TB, ZWK-3AZO). Compounds containing isophorene fragment in their molecules had the highest NLO efficiencies (d 33 up to 125.7 pm/V for IWK-2D) and also were the most effective holographic data storage compounds with holographic self diffraction efficiency 13% and holographic diffraction efficiency 20%, also for IWK-2D, but their thermal stability (T d from 288 o C to 295 o C) and glass transition (T g from 90 o C to 105 o C) values were just average. Pyranylidene type compounds had the highest thermal stability and highest glass transition (T g from 115 o C to 180 o C). But their ability to form and maintain amorphous structure were low and they had average NLO efficiencies (d 33 up to 66.2 pm/V for ZWK-2TB) and average holographic self diffraction efficiency 2% and holographic diffraction efficiency 8% for ZWK-3AZO. The molecules with just azobenzene fragment and indene-1,3-dione as electron acceptor has the lowest thermal (T d from 250 o C to 282 o C, T g from 70 o C to 98 o C) and also the lowest holographic properties with holographic diffraction and self diffraction efficiencies at 4% for WE-1 and lower for other compounds. Nevertheless, some of the investigated molecular glasses show potential as multifunctional optical materials.

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Stability of the functional NLO polymers–optically induced depoling of the DMABI molecules in sPMMA matrix

Cited by 8 publications

References 14 publications

Isosorbide based chiral polyurethanes: optical and thermal studies

Isosorbide based chiral polyurethanes: optical and thermal studies

Chromophore Poling in Thin Films of Organic Glasses. 2. Two-Electrode Corona Discharge Setup

Thermal, glass-forming, nonlinear optical and holographic properties of "push-pull" type azochromophores with triphenyl moieties containing isophorene and pyranylidene fragments

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