Holographic self-amplification in amorphous As-Se semiconductor films

Pashkevich, V.; Ketolainen, P.; Salminen, Olli

doi:10.1080/09500349608232828

Cited by 2 publications

(1 citation statement)

References 7 publications

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“…The SE effect was reported for the first time in 1973 by Gaylord et al [4] for phase holograms in photorefractive LiNbO 3 :Fe crystals. It has been observed also in photochromic KBr crystals [5], sillenite-type photorefractive Bi 12 Ti 0.76 V 0.24 O 20 crystals [6], amorphous chalcogenide As-S, As-Se films [2] [3] [7], dichromated gelatin and polyvinyl alcohol films [8] and photopolymers [9]. Three types of SE can be distinguished: i) coherent SE due to the holographic recording by diffracted waves; ii) incoherent SE due to the contrast and/or transmission increase of a hologram by incoherent light; iii) relaxational (or dark) SE due to the contrast and/or transmission increase of a hologram by thermostimulated relaxation processes.…”

Section: Introductionmentioning

confidence: 99%

Self-Enhancement of Scalar and Vector Holographic Gratings in Azobenzene Molecular Glassy Films

Ozols¹,

Kokars²,

Augustovs³

et al. 2014

OPJ

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Self-enhancement (SE) effect of scalar and vector holographic gratings (HG) recorded in three different azobenzene molecular glassy films is experimentally studied in both transmission and reflection modes at 532 and 633 nm. The maximal SE factor (the ratio of diffraction efficiency to its initial value) SEF = 42 has been achieved. It is shown that the model of complementary HG can be applied also in scalar transmission thin HG case to explain coherent SE. The possibility of vector HG coherent SE in transmission mode is experimentally demonstrated for the first time (SEF = 4.3). The possibility of coherent HG SE in reflection mode is also established for the first time (SEF = 21). HG recording processes as well as coherent SE processes are found to be independent in transmission and reflection modes being determined by volume and surface relief HG, respectively. The permittivity gradient mechanism is proposed to explain the coherent SE of surface relief HG. Both HG recording and coherent SE efficiencies strongly decrease when HG period is decreased from 2 µm to 0.5 µm. No relaxational SE effect is found. Coherent SE effect in molecular glasses is found to be weaker than in inorganic materials.

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Section: Introductionmentioning

confidence: 99%

Self-Enhancement of Scalar and Vector Holographic Gratings in Azobenzene Molecular Glassy Films

Ozols¹,

Kokars²,

Augustovs³

et al. 2014

OPJ

View full text Add to dashboard Cite

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Electron beam induced changes in the refractive index and film thickness of amorphous AsxS100−x and AsxSe100−x films

Nordman

Peyghambarian

1998

Journal of Applied Physics

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In this article, electron beam induced changes in the refractive index and film thickness of time relaxed amorphous AsxS100−x (with x=30–45) and AsxSe100−x (with x=40–70) are studied. The largest index change (∼0.08) in AsxS100−x films is found when x=40. The corresponding value (∼0.06) for AsxSe100−x films is met when x=55. The difference in the best compositions is attributed to the different relaxation processes of As–S and As–Se films. Electron beam irradiation causes surface shrinkage of the films. In AsxSe100−x films contractions are deepest (∼75 nm) when x=55.

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Holographic self-amplification in amorphous As-Se semiconductor films

Cited by 2 publications

References 7 publications

Self-Enhancement of Scalar and Vector Holographic Gratings in Azobenzene Molecular Glassy Films

Self-Enhancement of Scalar and Vector Holographic Gratings in Azobenzene Molecular Glassy Films

Electron beam induced changes in the refractive index and film thickness of amorphous AsxS100−x and AsxSe100−x films

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