Net two-beam-coupling gain in a polymeric photorefractive material

Donckers, M. C. J. M.; Silence, S. M.; Walsh, C. A.; Hache, F.; Burland, D. M.; Moerner, W. E.; Twieg, Robert J.

doi:10.1364/ol.18.001044

Cited by 114 publications

(37 citation statements)

References 14 publications

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“…τ −1 was found to increase sublinearly with light intensity, obeying a power-law dependence with exponent equal to 0.65 ± 0.05. Similar behaviour has been observed in several other photorefractive polymers [9,11,30,31] and is attributed to the presence of shallow traps.…”

Section: Properties Of the Photorefractive Gratingsupporting

confidence: 86%

“…Soon, photorefractivity was reported in several other composites, as well as fully functionalized materials [7]. The observation of net gain in a poly(N -vinylcarbazole) (PVK) based polymer doped with an NLO molecule [8] marked the beginning of a new era in polymer photorefractivity. The superior performance of this material was found to arise from the existence of an enhancement mechanism, which relies on the ability of the NLO molecules to reorient under the influence of the space charge field [3].…”

Section: Introductionmentioning

confidence: 99%

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Photorefractivity in poly(N-vinylcarbazole)-based polymer composites

et al. 1996

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Section: Properties Of the Photorefractive Gratingsupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Photorefractivity in poly(N-vinylcarbazole)-based polymer composites

et al. 1996

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“…The slides remained on the hot plate for 30 min after the dripping ceased to allow most of the solvent to evaporate. Fourth, two small glass spacers, 15 mm X 1 mm X 145 /um (cut from microscope cover slips) were placed on either side of the polymer on one of the glass slides as shown in Fig. 3(b).…”

Section: Characterizationmentioning

confidence: 99%

Photoconductivity and grating response time of a photorefractive polymer

et al. 1994

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We report the photoconductive properties and photorefractive grating response time of a polymer mixture composed of 40-wt. % dissolved diethylamino-benzaldehyde diphenyl hydrazone (DEH) and the non-cross-linking epoxy polymer Bisphenol A 4,4'-nitroaminostilbene. The films have improved photoconductive sensitivities as high as 2.1 x 10-1o cm/(W fi) at a wavelength of 650 nm with a corresponding reduction of the grating response time constant to 0.11 ± 0.02 s at an intensity of 1 W/cm 2 . The nitro-aminostilbene chromophore is deduced to be the source of photogenerated charge carriers on the basis of a comparison of the wavelength dependence of the photoconductivity and absorption coefficient. Degradation of the photoconductivity and the dark conductivity as well as of the photorefractive speed with sample age is attributed to precipitation of the DEH; this explanation is supported by x-ray diffraction observations of crystal growth in the polymer.

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“…From a practical point of view, the optical amplification, Γ, must exceed the absorption loss, R, of the PR sample in question. [37][38][39] In this case, the optical loss of the sandwiched sample (glass/ITO/polymer composite/ITO/glass) at 1.31 µm was measured to be R ) 4.2 cm -1 yielding a maximum net gain coefficient of Γ -R ) 30.9 cm -1 . An example of asymmetric exchange of energy is depicted in the inset in Figure 3, which confirms the PR nature of the NCPbS composite.…”

Section: Resultsmentioning

confidence: 92%

Inorganic: Organic Hybrid Nanocomposites for Photorefractivity at Communication Wavelengths

et al. 2002

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This paper reports new photorefractive polymeric nanocomposites photosensitized with HgS or PbS nanocrystals and operating at the communication wavelength of 1.3 µm. To our knowledge, it is the first report of a polymeric photorefractive medium with spectral response at a communication wavelength. The nanocomposites involving HgS are prepared by an in-situ nanochemistry approach, whereas those involving PbS were prepared using competitive nanochemistry. Photoconductivity experiments were employed in the characterization of photocharge generation quantum efficiency provided by the semiconductor nanocrystals. The photorefractive nature of the composites is confirmed using electric field dependent two-beam coupling. In the case of nanocomposite containing PbS nanocrystals, a net gain in excess of the associated absorption loss is observed.

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Net two-beam-coupling gain in a polymeric photorefractive material

Cited by 114 publications

References 14 publications

Photorefractivity in poly(N-vinylcarbazole)-based polymer composites

Photorefractivity in poly(N-vinylcarbazole)-based polymer composites

Photoconductivity and grating response time of a photorefractive polymer

Inorganic: Organic Hybrid Nanocomposites for Photorefractivity at Communication Wavelengths

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