Space charge-induced reorientation in polymethyne dye-doped nematics under excitation with nanosecond laser pulses

Serak, Svetlana V.; Kovalev, A. A.; Agashkov, A. V.

doi:10.1016/s0030-4018(00)00767-7

Cited by 12 publications

(4 citation statements)

References 9 publications

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“…1 These compounds were originally utilized as sensitizing additives to photographic emulsions, but their unique structural and photophysical characteristics have since proven useful for a wide variety of other applications requiring photosensitive materials, such as optical recording media and solar cells. 2–4 Additionally, cyanine dyes can be used as fluorescent labels of both proteins and DNA, thereby greatly enhancing the sensitivity of fluorescence detection for these types of biomolecules. 5–7 NIR-absorbing cyanine dyes are particularly well-suited for use as fluorescent labels of proteins and nucleic acids, as there is no interfering autofluorescence from biomolecules at these long wavelengths, and have been applied to both in vitro analytical studies and in vivo biomedical imaging.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Varying Short-Chain Alkyl Substitution on the Molar Absorptivity and Quantum Yield of Cyanine Dyes

2011

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The effect of varying short-chain alkyl substitution of the indole nitrogens on the spectroscopic properties of cyanine dyes was examined. Molar absorptivities and fluorescence quantum yields were determined for a set of pentamethine dyes and a set of heptamethine dyes for which the substitution of the indole nitrogen was varied. For both sets of dyes, increasing alkyl chain length resulted in no significant change in quantum yield or molar absorptivity. These results may be useful in designing new cyanine dyes for analytical applications and predicting their spectroscopic properties.

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Section: Introductionmentioning

confidence: 99%

The Effect of Varying Short-Chain Alkyl Substitution on the Molar Absorptivity and Quantum Yield of Cyanine Dyes

2011

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“…3 in PVK:TNF one can get an average value of the hole mobility equal to h ϭ10 Ϫ7 cm 2 /V s. Mobility value obtained from this novel measurement technique gives results comparable with that obtained by the other known methods. 4,14 In conclusion we propose a contactless diffraction based technique enabling charge carrier mobility evaluation in a very thin polymeric layer. We achieve this by measuring the temporal response of diffraction intensity of a LC panel equipped with thin layers of studied photoconducting polymer and irradiated by a short, 20 ps laser pulse.…”

mentioning

confidence: 99%

Dynamic charge-carrier-mobility-mediated holography in thin layers of photoconducting polymers

Bartkiewicz

Miniewicz

Sahraoui

et al. 2002

Applied Physics Letters

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Articles you may be interested inEnhanced photorefractivity in a polymeric composite photosensitized with carbon nanotubes grafted to a photoconductive polymerThe dynamic holography technique is proposed for the measurement of the charge-carrier-mobility in thin layers of a photoconducting polymer, used in optically addressed liquid-crystal spatial light modulators. The photorefractive properties of these modulators are studied under short-pulse ͑20 ps, 532 nm͒ laser illumination conditions and the charge mobility in the photoconducting polymer ( h ϭ10 Ϫ7 cm 2 /V s) is obtained from the temporal evolution of intensity of the first-order diffracted beam. A mechanism responsible for the grating formation is proposed and discussed.

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“…Drawing such a dependence for the first phenomenon, related to hole mobility in polymeric layer in function of inverse of the applied electric field, as it is shown in Fig. 8 and assuming mean and uniform electric field across the LC layer and polymeric layers one can evaluate the hole mobility ( L /2)d h y1 (3) where L is the thickness of polymeric layer, V is the applied voltage, d is the thickness of the panel (LC layer) and t1 is the time at which the first peak occurs, one obtains the average value of the hole mobility equal to Lh= iO cm2/Vs, which is comparable to that obtained by the other techniques [14,15].…”

Section: Dynamic Holography and Charge Mobilitymentioning

confidence: 53%

Optically addressable hybrid: photoconducting polymer-liquid crystal panels

et al. 2003

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The performances of photorefractive hybrid panels made from photoconducting polymer and nematic liquid crystal layers are reviewed and discussed. Their properties were studied under pulsed and cw illumination. The dynamic holography experiments with pulsed laser beams give information on the charge mobility in the thin photoconducting layers. The use of panels to visualize the phase objects introducing small distortions to plane wave front (such as e.g. turbulence of air) through the well-known Zemike filtering is also shown. The advantage of such nonlinear Zernike filter over conventional one is that no precise optical adjustment is necessary and the filtering is relatively easy to control by tuning the externally applied field to the modulator and/or varying the incoming light intensity.

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Space charge-induced reorientation in polymethyne dye-doped nematics under excitation with nanosecond laser pulses

Cited by 12 publications

References 9 publications

The Effect of Varying Short-Chain Alkyl Substitution on the Molar Absorptivity and Quantum Yield of Cyanine Dyes

The Effect of Varying Short-Chain Alkyl Substitution on the Molar Absorptivity and Quantum Yield of Cyanine Dyes

Dynamic charge-carrier-mobility-mediated holography in thin layers of photoconducting polymers

Optically addressable hybrid: photoconducting polymer-liquid crystal panels

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