In situ measurements of photoexpansion in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.svg"><mml:mrow><mml:mi>A</mml:mi><mml:msub><mml:mrow><mml:mi>s</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mi>S</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>bulk glass by atomic force microscopy

Moreno, Thiago; Zanuto, Vitor Santaella; Astrath, N. G. C.; Silva, Givanildo R.; Fonseca, Eduardo J.S.; Souza, Samuel T.; Zhao, Donghui; Jain, Himanshu; Malacarne, L. C.

doi:10.1016/j.optmat.2019.05.016

Cited by 13 publications

(4 citation statements)

References 35 publications

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“…This correlates with in situ studies of the transient component of photostimulated deformation of As 2 S 3 glass surface under 532 nm laser beam illumination where non‐thermal and thermal contributions into the illuminated film thickness increment were separated and local temperature increase was thereby evaluated. [ 67 ] Our experiments with films annealed up to 433 K demonstrated that such temperature is not sufficient to result in structural changes that can be evidenced by Raman spectroscopy. [ 45 ] It is a non‐thermal effect of photosoftening or photofluidity, a drastic decrease of the film viscosity in the illuminated area.…”

Section: Resultsmentioning

confidence: 99%

Ternary CdS_1–xSe_x nanocrystals formed in Cd‐doped As–Se–S films due to photoenhanced diffusion during micro‐Raman measurement

Azhniuk

Dzhagan

Solonenko

et al. 2021

J Raman Spectroscopy

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Micro‐Raman spectra of amorphous As–Se–S:Cd films prepared by thermal evaporation on silicon and silicate glass substrates measured at different laser power densities show the formation of CdS1–xSex nanocrystals in the As–Se–S:Cd film under laser beam illumination due to a photoinduced material transfer and photoenhanced diffusion in the laser spot area. The material transfer and the photoenhanced diffusion are caused by a non‐thermal interaction of light with the amorphous As–Se–S:Cd films. The chemical composition of the CdS1–xSex nanocrystals can be determined from the difference of the CdSe‐like and CdS‐like LO phonon wavenumbers in the Raman spectra. The photoluminescence peak energies are in agreement with the CdS1–xSex composition, with the average nanocrystal size being somewhat above the exciton Bohr radius.

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Section: Resultsmentioning

confidence: 99%

Ternary CdS_1–xSe_x nanocrystals formed in Cd‐doped As–Se–S films due to photoenhanced diffusion during micro‐Raman measurement

Azhniuk

Dzhagan

Solonenko

et al. 2021

J Raman Spectroscopy

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“…The permanent photoexpansion is much larger in magnitude and slower in kinetics than the transient or reversible changes. This could imply that As 2 S 3 has inherent properties that make it more susceptible to photoexpansion at lower laser powers [45].…”

Section: Resultsmentioning

confidence: 99%

“…thermal expansion. Numerical simulations revealed that the amplitude of thermoelastic deformation is negligible as compared to photoexpansion, suggesting a predominantly non-thermal origin [45]. Additionally, phenomena like photoinduced fluidity in chalcogenide glasses manifest athermally at low temperatures [41,48], further supporting nonthermal mechanisms.…”

Section: Averagementioning

confidence: 90%

Fs Laser Patterning of Amorphous As2S3 Thin Films

Mihai,

Jipa,

Socol

et al. 2024

Materials

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This study investigates the morphological changes induced by femtosecond (fs) laser pulses in arsenic trisulfide (As2S3) thin films and gold–arsenic trisulfide (Au\As2S3) heterostructures, grown by pulsed laser deposition (PLD). By means of a direct laser writing experimental setup, the films were systematically irradiated at various laser power and irradiation times to observe their effects on surface modifications. AFM was employed for morphological and topological characterization. Our results reveal a clear transition threshold between photoexpansion and photoevaporation phenomena under different femtosecond laser power regimes, occurring between 1 and 1.5 mW, irrespective of exposure time. Notably, the presence of a gold layer in the heterostructure minimally influenced this threshold. A maximum photoexpansion of 5.2% was obtained in As2S3 films, while the Au\As2S3 heterostructure exhibited a peak photoexpansion of 0.8%. The study also includes a comparative analysis of continuous-wave (cw) laser irradiation, confirming the efficiency of fs laser pulses in inducing photoexpansion effects.

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“…It was assumed that 20% of the laser power was lost due to reflection, and the remaining 80% was absorbed at the surface to heat the sample. Because thermal properties of Sb 2 S 3 glass were unavailable, the specific heat, density, and thermal conductivity of As 2 S 3 were substituted as a reasonable analogue . Changes in material properties with temperature due to structural and compositional changes were also neglected.…”

Section: Methodsmentioning

confidence: 99%

Polarization and Surface Effects on the Seed Orientation of Laser-Induced Sb₂S₃ Crystals on Sb-S-I Glass

Au-Yeung

Savytskii

Veenhuizen

et al. 2021

Crystal Growth & Design

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This study explores multiple fields as a mechanism of controlling the orientation of the nucleation process, which is generally believed to be a stochastic process, as observed in the equiaxed grain structure of glass ceramics. Specifically, as a model system, Sb2S3 single crystals are grown on the surface of Sb-S-I chalcogenide glass via laser crystallization. A spatial light modulator is used to configure the beam shape, thermal gradient, and/or polarization of the laser for controlling the orientation of Sb2S3 crystal seeds. We determine that the chemical and thermal gradient can affect the crystal morphology but do not significantly influence the crystal seed orientation. In contrast, the short crystal axis along [010] has a preferential alignment along the direction of polarization and perpendicular to the surface normal. Thus, we conclude that polarization can be used as an effective tool for controlling the nucleation and hence the orientation of Sb2S3 crystals on the surface of Sb-S-I chalcogenide glasses.

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In situ measurements of photoexpansion inAs2S3bulk glass by atomic force microscopy

Cited by 13 publications

References 35 publications

Ternary CdS_1–xSe_x nanocrystals formed in Cd‐doped As–Se–S films due to photoenhanced diffusion during micro‐Raman measurement

Ternary CdS_1–xSe_x nanocrystals formed in Cd‐doped As–Se–S films due to photoenhanced diffusion during micro‐Raman measurement

Fs Laser Patterning of Amorphous As2S3 Thin Films

Polarization and Surface Effects on the Seed Orientation of Laser-Induced Sb₂S₃ Crystals on Sb-S-I Glass

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In situ measurements of photoexpansion inAs2S3bulk glass by atomic force microscopy

Cited by 13 publications

References 35 publications

Ternary CdS1–xSex nanocrystals formed in Cd‐doped As–Se–S films due to photoenhanced diffusion during micro‐Raman measurement

Ternary CdS1–xSex nanocrystals formed in Cd‐doped As–Se–S films due to photoenhanced diffusion during micro‐Raman measurement

Fs Laser Patterning of Amorphous As2S3 Thin Films

Polarization and Surface Effects on the Seed Orientation of Laser-Induced Sb2S3 Crystals on Sb-S-I Glass

Contact Info

Product

Resources

About

Ternary CdS_1–xSe_x nanocrystals formed in Cd‐doped As–Se–S films due to photoenhanced diffusion during micro‐Raman measurement

Ternary CdS_1–xSe_x nanocrystals formed in Cd‐doped As–Se–S films due to photoenhanced diffusion during micro‐Raman measurement

Polarization and Surface Effects on the Seed Orientation of Laser-Induced Sb₂S₃ Crystals on Sb-S-I Glass