Poling kinetics and second order NLO properties of DCNP doped PMMA based thin film

Manea, Adrian; Rău, Ileana; Tane, Alexandrina; Kajzar, F.; Sznitko, Lech; Miniewicz, Andrzej

doi:10.1016/j.optmat.2013.05.012

Cited by 15 publications

(22 citation statements)

References 27 publications

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“…DCNP crystals show excellent electro‐optic properties and efficient second harmonic generation (SHG) . Similar effects may be achieved by poling of polymer thin films containing polar DCNP molecules . Amplified spontaneous emission has been observed for DCNP in a polymethyl methacrylate matrix, proving that DCNP is a suitable fluorescent molecule in rigid environments.…”

Section: Introductionmentioning

confidence: 90%

“…[15] Similar effects may be achieved by poling of polymer thin films containing polar DCNP molecules. [16,17] Amplified spontaneous emission has been observed for DCNP in ap olymethyl methacrylate matrix, [18] provingt hat DCNP is as uitable fluorescent molecule in rigid environments. This result-as well as the nanosecondf luorescenced ecay time observed in DCNP crystals at room temperature [15] -suggests that this compound ( Figure 1), having ad icyanog roup, can be ag ood candidate for molecular rotors.…”

Section: Introductionmentioning

confidence: 97%

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Environment‐Sensitive Behavior of DCNP in Solvents with Different Viscosity, Polarity and Proticity

et al. 2015

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A pyrazoline derivative, 3-(1,1-dicyanoethenyl)-1-phenyl-4,5-dihydro-1H-pyrazole (DCNP), is studied by using optical spectroscopy methods in several solvents at room and at low temperatures. The DCNP molecule reveals a complex photophysics behavior, which is sensitive to solvent polarity, proticity, temperature and viscosity and arises from the presence of two rotational degrees of freedom of the dicyanovinyl group--the torsion around the double C=C bond and the s-trans-s-cis isomerization around the single C-C bond--that differently behave in various environmental conditions. The fluorescence yield of a few percent and sub-nanosecond decay times observed at room temperature make the compound useful for optical studies of liquid environments. The proticity of polar solvents can be detected with two-exponential fluorescence decays. At low temperatures, DCNP can be used as solvent viscosity or temperature fluorescent sensor.

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Section: Introductionmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 97%

Environment‐Sensitive Behavior of DCNP in Solvents with Different Viscosity, Polarity and Proticity

et al. 2015

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“…by a corona poling process, also show the efficient SHG phenomenon. [16][17][18] The common property of the majority of molecular crystals, even those of the best quality, is the presence of trap states, which may be due to structural faults, vacancies, or chemical impurities. Particularly, for the DCNP we believe that the traps are of structural origin.…”

Section: Introductionmentioning

confidence: 99%

On the origin of fluorescence emission in optically non-linear DCNP crystals

Morawski

Sobolewski

Kozankiewicz

et al. 2014

Phys. Chem. Chem. Phys.

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We study absorption and emission spectra of optically nonlinear single crystals of 3-(1,1-dicyanoethenyl)-1-phenyl-4,5-dihydro-1H-pyrazole (DCNP) at 5 K. We argue that fluorescence has a complex origin, it is emitted from the excitonic band, with the bottom at ∼18,115 cm(-1), and from trap states, and the two main traps have depths of ∼875 and ∼2465 cm(-1). The excitonic origin of the emission is confirmed by the vibrational structure of fluorescence, closely resembling vibrations observed in the Raman scattering spectrum (recorded for DCNP crystals at 295 K) and by very short decay time of the excitonic emission, as a consequence of exciton migration and trapping at deep traps.

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“…The applicable poled area of this study was set at 13.5 cm 2 from the bench-top experiments, and we believe it can be further expanded to the scale of 40−80 cm 2 by using larger systems. In the past, soda-lime glass has been used as an excellent substrate in the corona and contact poling of nonlinear optical (NLO) polymers and ferroelectric polymers [13,20,21]. While we have gained much insight from these studies and some of the recent research efforts in using a barrier layer to improve the poling of EO polymers, our present study has advantages over previous similar ones because of its simplicity, quantitative control of field strength over a large poled area, short poling time, relatively low applied voltages, no reactive corona ions generated, and little to no dielectric breakdown damages.…”

Section: Discussionmentioning

confidence: 99%

Efficient wafer-scale poling of electro-optic polymer thin films on soda-lime glass substrates: large second-order nonlinear coefficients and exceptional homogeneity of optical birefringence

Luo

Park

Himmelhuber

et al. 2017

Opt. Mater. Express

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Abstract:We demonstrate a simple protocol for repeatable and efficient contact poling of guest-host electro-optic (EO) polymer thin films over large areas on soda-lime glass substrates. The poled large-area (up to 13.5 cm 2 ) thin films in this study exhibit very large second-order nonlinear susceptibilities (d 33 values of 330−520 pm/V) for second-harmonic generation (SHG) and associated large Pockels coefficients (r 33 values of 105−180 pm/V) at the wavelength of 1.3 μm. The poling protocol also produced poled EO thin films with excellent optical homogeneity and large positive birefringence with small variation (~10 −3 ) of refractive indices over the poled large areas. The study suggests a viable and scalable path towards the realization of integrated photonics based on pre-poled thin films of high performance EO polymers. polymer thin films across a 1.1-mm thick glass substrate by pyroelectric crystals," Appl.

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Poling kinetics and second order NLO properties of DCNP doped PMMA based thin film

Cited by 15 publications

References 27 publications

Environment‐Sensitive Behavior of DCNP in Solvents with Different Viscosity, Polarity and Proticity

Environment‐Sensitive Behavior of DCNP in Solvents with Different Viscosity, Polarity and Proticity

On the origin of fluorescence emission in optically non-linear DCNP crystals

Efficient wafer-scale poling of electro-optic polymer thin films on soda-lime glass substrates: large second-order nonlinear coefficients and exceptional homogeneity of optical birefringence

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