Critical discussion of models proposed to explain photo‐induced anisotropies in chalcogenide glasses

Fritzsche, H.

doi:10.1002/pssb.200982004

Cited by 13 publications

(8 citation statements)

References 30 publications

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“…Another possibility is extremely effective optical poling due to existence of Hg‐I dipoles. This effect can also be concerned with the effect of optically induced anisotropy found in chalcogenide glasses …”

Section: Discussionmentioning

confidence: 99%

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Intrinsic second‐order nonlinearity in chalcogenide glasses containing HgI₂

et al. 2020

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Frequency conversion using nonlinear optical (NLO) crystals is widely used in advanced photonic technologies to produce coherent light in the spectral regions where the available laser sources are missing. Isotropic glasses usually do not show second order nonlinear processes like second harmonic or difference frequency generation (SHG, DFG) except for temporarily induced anisotropy under external stimuli. Here, we show that a HgI2–Ga2S3–GeS2 homogeneous glass exhibits a strong intrinsic SHG response comparable with that of the well‐known NLO single crystal LiNbO3. The origin of this extremely rare phenomenon seems to be noncentrosymmetric bent HgI2 molecules embedded in a sulfide glassy host. Taking into account the unique properties of chalcogenide glasses (wide IR transmission, low phonon density, unlimited ability to be modified changing the appropriate glass properties, fiber drawing and thin layer design), the observed phenomenon opens up the possibility of creating fundamentally new devices for mid‐IR photonics.

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Section: Discussionmentioning

confidence: 99%

“…This effect can also be concerned with the effect of optically induced anisotropy found in chalcogenide glasses. 36…”

Section: Discussionmentioning

confidence: 99%

Intrinsic second‐order nonlinearity in chalcogenide glasses containing HgI₂

et al. 2020

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“…This difference was explained in [6] by assuming two mechanisms of photoalignment. The first one is related to a lightinduced anisotropy in the chalcogenide layer, [7,8] and the second one involves a LC in the process.…”

Section: Please Scroll Down For Articlementioning

confidence: 99%

Photoalignment in the isotropic phase of liquid crystal on chalcogenide glass film

et al. 2014

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We discovered the phenomenon of liquid crystal (LC) alignment on a photosensitive chalcogenide glass film As 20 Se 80 after irradiation of the LC in the isotropic phase with polarised light. The photoalignment was observed after cooling of the LC to the nematic phase. Quality of the photoalignment depended on an initial phase state of the LC. If the photoalignment was uniform at the irradiation of the isotropic phase of the LC that initially was pre-aligned in the nematic phase, the irradiation of the cell being filled in the isotropic phase resulted in inhomogeneous photoalignment. The orientation of the LC strongly depended on the geometry of the irradiation the LC in the cell. In the case of the direct irradiation of the chalcogenide surface, the photoorientation of the LC was stable. On the contrary, the irradiation of the chalcogenide surface through the LC layer led to the temporal photoalignment that diminished within few days. The results are explained in the frame of the model that suggests two mechanisms of photoalignment. The first one is related to a light-induced anisotropy on chalcogenide layer and the second one involves a LC in the process. We assume that an anisotropic light-induced desorption of LC molecules from the chalcogenide layer is the origin of last kind of photoalignment. The asymmetry of the photoalignment properties at the irradiation from the different sides of the chalcogenide surface is explained by producing different surface structures at the irradiation from the different sides.

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“…Experiments by Tanaka have shown that it isn't conditioned by impurities. A critical viewpoint of models proposed to explain photoinduced effects in chalcogenide glasses was presented by Fritzsche [20], one of the founders of the science of photo-induced transformations in chalcogenide glasses. He believes that there are two kinds of effects inducing changes in CHG. Effect of the first type is related to reconstruction of bistable centres.…”

Section: Photoinduced Changes In Glassesmentioning

confidence: 99%

Barrier–cluster–heating model and photoinduced phenomena in chalcogenide glasses

Banik

Lukovičová

Sarkar

et al. 2014

AIP Conference Proceedings

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Barrier-cluster-heating model of disordered semiconductors was originated by synthesis of the barriercluster model (which was described in the previous works of authors) and of the local heating model (published short time ago). The synthesis of these two models brought synergic effect enabling deeper understanding of physical processes in amorphous semiconductors. The article gives a new view on the essence of some optical and photoinduced effects in chalcogenide glasses on the base of the barrier-cluster-heating model.

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Critical discussion of models proposed to explain photo‐induced anisotropies in chalcogenide glasses

Cited by 13 publications

References 30 publications

Intrinsic second‐order nonlinearity in chalcogenide glasses containing HgI₂

Intrinsic second‐order nonlinearity in chalcogenide glasses containing HgI₂

Photoalignment in the isotropic phase of liquid crystal on chalcogenide glass film

Barrier–cluster–heating model and photoinduced phenomena in chalcogenide glasses

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Critical discussion of models proposed to explain photo‐induced anisotropies in chalcogenide glasses

Cited by 13 publications

References 30 publications

Intrinsic second‐order nonlinearity in chalcogenide glasses containing HgI2

Intrinsic second‐order nonlinearity in chalcogenide glasses containing HgI2

Photoalignment in the isotropic phase of liquid crystal on chalcogenide glass film

Barrier–cluster–heating model and photoinduced phenomena in chalcogenide glasses

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Product

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Intrinsic second‐order nonlinearity in chalcogenide glasses containing HgI₂

Intrinsic second‐order nonlinearity in chalcogenide glasses containing HgI₂