Holographic recording of surface relief gratings in stilbene azobenzene derivatives at 633 nm

Ozols, Andris; Saharov, D.; Kokars, Valdis; Kampars, Valdis; Maļeckis, Ansis; Mežinskis, Gundars; Plūdons, Artūrs

doi:10.1088/1742-6596/249/1/012055

Cited by 8 publications

(12 citation statements)

References 7 publications

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“…SDE is a ratio of a first-order diffracted beam power to the power of the more distant recording beam without the interruption of recording beams. The mathematical relation between SDE and DE is described in [10]. In our experiments we have estimated that SDE ≈ (0.5-1.6)DE.…”

Section: Samples and Experimental Proceduresmentioning

confidence: 72%

Polarization dependence of holographic recording in glassy azocompounds

Ozols¹,

Kokars²,

Augustovs³

et al. 2010

Lithuanian J. Phys.

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Polarization dependence of holographic grating recording in glassy molecular azobenzene films 8a, 11, and 16 has been experimentally studied at 633 and 532 nm with s-s, p-p, CE-1 and CE-2 circular-elliptic (differing by light electric field rotation directions) recording beam polarizations. Samples 8a and 11 with the simplest chemical structure were the most efficient at 633 nm, and sample 8a was the most efficient at 532 nm. Self-diffraction efficiency (SDE) up to 45% was achieved in 8a with p-p polarized recording beams at 633 nm. Linear p-p polarizations were the most efficient at 633 nm whereas CE-1 polarizations were the best at 532 nm. It was found that the light polarization changes in the process of diffraction depend on chemical composition, wavelength, and exposure time. Vector gratings with SDE up to 25% were recorded in 8a rotating a linear polarization by 90• . Mainly erasure of gratings took place with one beam. Coherent self-enhancement of gratings was observed only for s-p and both CE polarizations in 8a at 532 nm and for s-p polarizations at 633 nm. Atomic force microscopy measurements also were made. The evidence is found for trans-cis photoisomerization holographic recording mechanism at both 532 and 633 nm. Studied films can be applied for production of polarization holographic optical elements and for permanent optical information recording.

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Section: Samples and Experimental Proceduresmentioning

confidence: 72%

Polarization dependence of holographic recording in glassy azocompounds

Ozols¹,

Kokars²,

Augustovs³

et al. 2010

Lithuanian J. Phys.

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“…The LiTaO 3 :Fe crystal is linearly anisotropic [5], therefore scalar-grating vectorial recording , obviously, is due to a nonzero 13 electro-optic tensor component and the photorefractive effect [5].…”

Section: Resultsmentioning

confidence: 99%

“…SDE is a ratio of a first-order diffracted beam power to the power of the more distant recording beam when both recording beams are present. The mathematical relation between SDE and diffraction efficiency DE [5] is described elsewhere [13]. Polarization of diffracted beams during and after the − recording with orthogonally polarized beams was studied by a polarizer to compare with the predictions of theory [10].…”

Section: Samples and Experimentsmentioning

confidence: 99%

“…Recently we have found that quite efficient holographic recording is possible by a red He-Ne laser light in stilbene azobenzene derivatives, including surface relief grating (SRG) recording with a 226 nm thickness change [13][14][15]. The conclusion is, most probably, the azochromophore photodegradation mechanism was responsible for SRG recording, but other mechanisms can contribute as well, including trans-cis photoisomerization and chromophore photoorientation, accompanied by coordinated alignment of adjacent backbone segments and recharging of acceptor states.…”

Section: Introductionmentioning

confidence: 99%

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Effect of light polarization on holographic recording in glassy azocompounds and chalcogenides

et al. 2011

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Abstract:Light polarization effects on a holographic grating recording in a glassy chalcogenide a-As 40 S 15 Se 45 film has been experimentally studied and compared with previously studied glassy molecular azobenzene film 8a at 633, using − − , CE-1 and CE-2 circular-elliptic recording-beam polarizations (differing by light electric field rotation directions). The azocompound exhibited much higher self-diffraction efficiency (SDE) and diffraction efficiency, whereas chalcogenide was more sensitive. Their recording efficiency polarization dependences also were different. SDE up to 45% was achieved in 8a with − and up to 2.6% in a-As 40 S 15 Se 45 with CE-2 polarized recording beams. The polarization changes in the diffraction process were studied as well in these and other materials (11, 16, 19 and a-As 2 S 3 film, LiTaO 3 :Fe crystal). It was found that light polarization changes in the process of diffraction from gratings recorded vectorially by − polarizations depended on chemical composition, wavelength, and exposure time. Vector gratings with SDE up to 25% were recorded in 8a, rotating a linear polarization by 90°. No light polarization changes were found in azobenzene 19 and chalcogenide films and in LiTaO 3 :Fe crystal, thus showing a vector recording of scalar holograms. The recording mechanisms in azocompounds and chalcogenides are discussed and compared. 42.25.Ja, 42.25.Gy, 68.35.bj, 68.35.bm PACS (2008):

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“…In our previous studies we have investigated azobenzene and chalcogenide films with respect to holographic recording. We have experimentally found that quite efficient recording is possible in both classes of materials [4,5]. It is also found that recording efficiency strongly depends on both recording light and readout light polarization [6].…”

Section: Introductionmentioning

confidence: 99%