Optimization of linear and nonlinear optical parameters of As40Se50Te10 thin films by thermal annealing

et al. 2021

J. Am. Ceram. Soc.

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The alloying of chalcogen elements with other group members form very effective and dynamic optical systems which are used in optoelectronics, photonic materials, phase change materials, and light communication purposes. [1][2][3] The unique nature of such materials is that their properties can be easily tuned by varying the composition, 4 thermal annealing, 5 photoinduced diffusion, 6 ion irradiation, 7 laser irradiation, 8 and many other techniques. The structural flexibility due to the available lone pair electrons makes it easy for such kind of changes which brings high transparency, low phonon energy, high linear, and non-linear refractive indices, and thirdorder non-linear susceptibility. 9 The addition of the third element into the binary compounds brings drastic changes in its structural (amorphous-crystalline), 10 optical (bandgap, refractive index, absorption coefficient, extinction coefficient, optical density, skin depth, dispersion parameters), 11,12 electrical (electrical conductivity, Hall coefficient), 13 thermal (thermal conductivity), electronic (electronic susceptibility,

Section: Optical Density (Od) and Skin Depth (δ)mentioning

confidence: 99%

Role of Bismuth incorporation on the structural and optical properties in Bi_xIn_35‐xSe₆₅ thin films for photonic applications

Priyadarshini¹,

Das²,

et al. 2021

J. Am. Ceram. Soc.

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“…Similarly, the introduction of Te in the Ag 60 Se 40 matrix results in additional peaks at 167 and 127 cm −1 . The peak at 127 cm −1 corresponds to the β‐phase of Ag 2 Se vibrational bond 38 and the 167 cm −1 39 sharp peak corresponds to the Te‐Te homopolar bond which got shifted toward a higher wavenumber value at 172 cm −1 due to the higher concentration of Te in Ag‐Se matrix.…”

Section: Resultsmentioning

confidence: 99%

Role of tellurium addition on the linear and non‐linear optical, structural, morphological properties of Ag_60‐_xSe₄₀Te_x thin films for nonlinear applications

Das¹,

Priyadarshini²,

et al. 2022

J Am Ceram Soc

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The tellurium (Te)-doped Ag 60-x Se 40 Te x (x = 0%, 5%, 10%, 15%) thin films of thickness ∼800 nm were prepared from the bulk sample by thermal evaporation method on a glass substrate. The X-ray diffraction study revealed the amorphous nature of the films whereas the change in vibrational modes was noticed from the Raman spectroscopy. The composition of the films was verified by energy dispersive X-ray analysis and the surface morphology pictures were taken by field emission scanning electron microscopy and atomic force microscope. The changes in optical properties (linear and non-linear) with Te addition were studied from UV-Visible spectroscopy data and related empirical formulas. The addition of Te reduced the bandgap values significantly and the reduction in transmission resulted in the increase of the linear refractive index. The decrease in optical bandgap is due to an increase in disorder while the width of the tail in the gap increased with Te%. The optical density, dispersion energy, extinction coefficient, carrier concentration, dielectric constant, oscillator wavelength increased while the oscillator energy, oscillator strength, optical electronegativity decreased with Te content. The electrical susceptibility increased with Te content. The non-linear susceptibilities and the non-linear refractive index increased which is good for the nonlinear photonic devices.

Section: Resultsmentioning

confidence: 99%

“…The increase in the nonlinear susceptibility may be due to the enhanced irradiation induced interactions between the fragments which increased the polymerization and homogenization inside the material, that then enhanced the susceptibility. 71 In addition, the nonlinear refractive index, n 2 of the investigated lms were evaluated using Ticha and Tichy, and Miller's rule given by: 72…”

Section: Nonlinear Optical Propertiesmentioning

confidence: 99%

The impact of fluence dependent proton ion irradiation on the structural and optical properties of Bi₅In₃₀Se₆₅ thin films for nonlinear optical devices

Priyadarshini¹,

Das²,

et al. 2022

RSC Adv.

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