Photo‐Induced Anisotropy in Chalcogenide Glassy Semiconductors

Lyubin, V.; Klebanov, M.

doi:10.1002/9783527602544.ch6

Cited by 15 publications

(18 citation statements)

References 45 publications

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“…2) testifies existence of possible radiation-induced additional intrinsic anisotropy in the glass studied on the MRO scale. The observed effect correlates with known photo-induced anisotropy in chalcogenide glasses [52]. Sharper drop in the depolarization ratio of the γ-irradiated sample as compared to unirradiated one in the high-frequency region of the depolarization ratio spectra can be caused by decreasing the inelastic Raman scattering cross section, probably, due to radiation-structural transformations.…”

supporting

confidence: 73%

Radiation-induced structural changes in chalcogenide glasses as revealed from Raman spectroscopy measurements

Kavetskyy¹

2013

Semicond. Phys. Quantum Electron. Optoelectron.

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Abstract. Radiation-induced structural changes in the chalcogenide glasses of (As 2 S 3 ) x (GeS 2 ) 1-x system with x = 0.1, 0.2, 0.4, and 0.6 corresponding to the chemical compositions Ge 28.125 As 6.25 S 65.625 , Ge 23.5 As 11.8 S 64.7 , Ge 15.8 As 21 S 63.2 , and Ge 9.5 As 28.6 S 61.9 , respectively, were studied using the Raman spectroscopy technique in detail. The polarized (VV) and depolarized (VH) Raman spectra were recorded separately for two identical samples in the unirradiated and γ-irradiated states which allowed performing all measurements under the same experimental conditions. The Raman spectra were considered in the regions of high-frequency excitations related with the molecular peak, and low-frequency excitations related with the boson peak. The depolarization ratio spectra for the unirradiated and -irradiated samples were examined, too. The differential Raman spectra in the high-frequency region between unirradiated and -irradiated samples were obtained only in the VH configuration, since no spectral variations in the VV configuration were detected for all the compositions studied. Employing the differential representation ( I) and unirradiated ( R unirrad. I) samples, it has been found out that the radiation-induced structural changes are significant only for the glass composition with x = 0.4, while these changes are practically absent in the case of the glass compositions with x = 0.1, 0.2, and 0.6. The applied differential procedure allows also to detect the radiation-induced effects in clusters of corner-shared and edge-shared tetrahedral, which was not possible with IR Fast Fourier Transform spectroscopy due to different activity of IR and Raman bands. In addition, it was shown that the controversial companion c A 1 mode at 370 cm -1 to the main 340 cm -1 A 1 symmetric mode of vibrations in cornershared tetrahedra seems to be related mainly to the vibrations of edge-shared tetrahedra. The possible nanoscale structural mechanism to account for these spectral changes has been discussed.

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confidence: 73%

Radiation-induced structural changes in chalcogenide glasses as revealed from Raman spectroscopy measurements

Kavetskyy¹

2013

Semicond. Phys. Quantum Electron. Optoelectron.

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“…Accordingly, after the exposure, the glass possesses anisotropic properties. This model is successful in understanding the socalled negative anisotropy, 9,10,34 e.g., negative dichroism ␣͑ʈ͒Ͻ␣͑Ќ͒, where ␣͑ʈ͒ and ␣͑Ќ͒ are absorption coefficients parallel and perpendicular to the electric field of excitation light. Nevertheless, several structural models have been proposed for the anisotropic element, 9 which remains to be studied.…”

Section: Discussionmentioning

confidence: 99%

“…Note that this model is consistent with other observations such as the photoinduced oriented crystallization in Se, for which folded chains seem to be responsible. 9,10,12 We assume that, upon prolonged illumination, intrasegmental disordering occurs, which causes with combination of photoinduced fluidity [30][31][32] the anisotropic M-shaped deformation. 25 On the other hand, the isotropic expansion is assumed to reflect structural disordering.…”

Section: Discussionmentioning

confidence: 99%

“…2,3 In addition, in some phenomena, illumination of linearly polarized light provides anisotropic changes, which are referred to as vectoral. 1,2,9,10 Not only the photon energy but also the direction of electric fields exerts some influence on the photostructural processes. Known examples are photoinduced dichroism, 11 birefringence, 11 and anisotropic crystallization.…”

Section: Introductionmentioning

confidence: 99%

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Polarization-dependent photoinduced mechanical deformations in covalent chalcogenide glasses

Asao¹,

Tanaka²

2007

Journal of Applied Physics

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The optomechanical effect and photoinduced anisotropic deformation induced by illumination of linearly polarized light have been comparatively studied for glassy As 2 S 3 and Se films. The two materials show qualitatively the same behaviors in the mechanical effect and the deformation, which suggests that these photoinduced phenomena are inherent to the covalent chalcogenide glass. But, the two phenomena show different dependences upon intensity, spectrum and exposure time of excitation light, which imply different underlying mechanisms.

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“…Since then hundreds of papers elucidating these effects and discovering new ones have been published [3][4][5][6]. Most of these papers say that the origin and mechanism of the PA are not known despite an increasing number of detailed theories and proposals aimed at explaining them.…”

Section: Introductionmentioning

confidence: 99%

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

Fritzsche¹

2009

Physica Status Solidi (b)

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Different theories explaining the origin and the mechanism of the dynamic part of photo‐induced anisotropies which are observed in a large family of chalcogenide glasses will be discussed and analyzed. It is useful to distinguish two kinds of photo‐induced anisotropies, Type 1 which involves a limited concentration of bistable anisotropic defects or centers and Type 2 which encompasses most of the materials.

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Photo‐Induced Anisotropy in Chalcogenide Glassy Semiconductors

Cited by 15 publications

References 45 publications

Radiation-induced structural changes in chalcogenide glasses as revealed from Raman spectroscopy measurements

Radiation-induced structural changes in chalcogenide glasses as revealed from Raman spectroscopy measurements

Polarization-dependent photoinduced mechanical deformations in covalent chalcogenide glasses

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

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