Structure and optical properties of PECVD-prepared As-Se-Te chalcogenide films designed for the IR optical applications

2018 ◽  
Author(s):  
Aleksey Nezhdanov ◽  
Leonid Mochalov ◽  
Dmitry Usanov ◽  
Mikhail Kudryashov ◽  
Alexandr Logunov ◽  
...  
Keyword(s):  
Optical Properties ◽  
Chalcogenide Films ◽  
Optical Applications

scholarly journals Theoretical and experimental comparative studies of nonlinear optical properties for selected melaminium compounds

2010 ◽  
Vol 8 (6) ◽  
pp. 1192-1202 ◽  
Author(s):  
Marek Drozd ◽  
Mariusz Marchewka
Keyword(s):  
Optical Properties ◽  
Acetic Acid ◽  
Nonlinear Optical ◽  
Time Dependent ◽  
X Ray ◽  
Hartree Fock ◽  
Optical Applications ◽  
Experimental Values ◽  
Nonlinear Optical Applications ◽  
Theoretical Results

AbstractThe bis(melaminium) sulphate dihydrate, 2,4,6-triamine-1,3,5-triazin-1,3-ium tartrate monohydrate, 2,4,6-triamine-1,3,5-triazin-1-ium hydrogenphthalate, 2,4,6-triamine-1,3,5-triazin-1-ium acetate acetic acid solvate monohydrate, 2,4,6-triamine-1,3,5-triazin-1-ium bis(selenate) trihydrate, melaminium diperchlorate hydrate, melaminium bis(trichloroacetate) monohydrate and melaminium bis(4-hydroxybenzenesulphonate) dihydrate were discovered recently as perspective materials for nonlinear optical applications. On the basis of X-ray structures for eight melaminium compounds the time dependent Hartree Fock (TDHF) method was used for calculation of the polarizability, and first and second hyperpolarizability. Detailed directional studies of calculated hyperpolarizability for all investigated melaminium compounds are shown. The theoretical results are compared with experimental values of β.

Ultrafast non-linear optical properties of Ge20As25Se55 chalcogenide films

2006 ◽  
Vol 258 (1) ◽  
pp. 72-77 ◽  
Author(s):  
Qiming Liu ◽  
Bing Lu ◽  
Xiujian Zhao ◽  
Fuxi Gan ◽  
Jun Mi ◽  
...  
Keyword(s):  
Optical Properties ◽  
Chalcogenide Films ◽  
Non Linear ◽  
Linear Optical Properties ◽  
Linear Optical

scholarly journals Structural, Optical, and Magnetic Properties of Gd Doped CdTe Quantum Dots for Magnetic Imaging Applications

2022 ◽  
Author(s):  
Shanmugapriya V ◽  
Bharathi S ◽  
Esakkinaveen D ◽  
Arunpandiyan S ◽  
Selvakumar B ◽  
...  
Keyword(s):  
Optical Properties ◽  
Plane Waves ◽  
Theoretical Data ◽  
Blue Shift ◽  
Generalized Gradient ◽  
Electronic And Optical Properties ◽  
Magnetic Imaging ◽  
Optical Applications ◽  
Indirect Band Gap ◽  
Pseudo Potential

Abstract The effect of pressure on the electronic and optical properties of SrAl2O4 up to 25 GPa was studied by means of the pseudo-potential plane waves method within the generalized gradient approximation for exchange and correlation. The calculated lattice parameters are consistent with available experimental and theoretical data. By analyzing the electronic and optical properties, the pressure dependences of the electronic structures and optical constants were investigated. The band structures show an indirect band gap for this compound and the calculated band gaps expend with increasing pressure. Meanwhile, the optical properties including the dielectric spectra, absorption coefficient spectra, reflectivity, and the real part of the refractive index spectra in the low energy range have a blue shift. Given this, the optical properties of SrAl2O4 could be tuned by changing pressure to some degree, which is beneficial to the optical applications.

scholarly journals The Study of the Optical Properties of C60 Fullerene in Different Organic Solvents

2019 ◽  
Vol 17 (1) ◽  
pp. 1198-1212 ◽  
Author(s):  
Teguh Endah Saraswati ◽  
Umam Hasan Setiawan ◽  
Mohammad Rifki Ihsan ◽  
Isnaeni Isnaeni ◽  
Yuliati Herbani
Keyword(s):  
Optical Properties ◽  
Organic Solvents ◽  
Emission Band ◽  
Diffuse Reflectance ◽  
Diffuse Reflectance Spectroscopy ◽  
Reflectance Spectroscopy ◽  
C60 Fullerene ◽  
Absorbance Spectroscopy ◽  
Polar Organic Solvents ◽  
Optical Applications

AbstractC60 fullerene exhibits unique optical properties that have high potential for wide photo-optical applications. To analyze the optical properties of C60, its excitation and emission properties were studied using UV-Vis absorption and photoluminescence (PL) spectroscopy, which were performed in various, non-polar organic solvents such as toluene, xylene, and trichloroethylene (TCE). The C60 solutions in toluene, xylene, and TCE displayed similar excitation bands at 625, 591, 570, 535, and 404 nm corresponding to Ag → T1u and Ag → T1g transitions. However, these bands differed from the solid C60 observed by UV-Vis diffuse reflectance spectroscopy. The two emission band energies of C 60 solution in toluene and xylene were nearly the same (1.78 and 1.69 eV), whereas the C60 solution in TCE was shifted to 1.72 and 1.65 eV. Because the polarity of TCE is higher than that of toluene and xylene, the PL spectrum of the C 60 solution in TCE was red-shifted. The PL spectroscopy had a better capability than UV-Vis absorbance spectroscopy to distinguish the different interactions between C60 and the organic solvents due to their different solvent polarities.

scholarly journals Development of the Morphology and the Band Gap Energy of Co–Si Nanofibers by Inserting Zirconium and Titanium with Dual Anions Intercalation Process

2019 ◽  
Vol 9 (22) ◽  
pp. 4775 ◽  
Author(s):  
Osama Saber ◽  
Nagih M. Shaalan ◽  
Aya Osama ◽  
Adil Alshoaibi
Keyword(s):  
Optical Properties ◽  
Band Gap ◽  
Optical Materials ◽  
Band Gap Energy ◽  
Gap Energy ◽  
Intercalation Process ◽  
Trivalent Cations ◽  
Optical Applications ◽  
Double Hydroxides ◽  
First Time

The plate-like structure is the most familiar morphology for conventional layered double hydroxides (LDHs) in case their structures consist of divalent and trivalent cations in their layers. In this study, nanofibers and nanoneedles of Co–Si LDHs were prepared for the first time. By the inclusion of zirconium inside the nanolayers of LDH structures, their plates were formed and transformed to nanofibers. These nanofibers were modified by the insertion of titanium to build again plate-like morphology for the LDH structure. This morphology controlling was studied and explained by a dual anions intercalation process. The optical properties of Co–Si LDHs indicated that the incorporation of zirconium within their nanolayers decreased the band gap energy from 4.4 eV to 2.9 eV. Following the same behavior, the insertion of titanium besides zirconium within the nanolayers of Co–Si LDHs caused a further reduction in the band gap energy, which became 2.85 eV. Although there is no data for the optical properties of Co–Si LDHs in the literature, it is interesting to observe the low band gap energy for Co–Si LDHs to become more suitable for optical applications. These results concluded that the reduction of the band gap energy and the formation of nanofibers introduce new optical materials for developing and designing optical nanodevices.

A thorough understanding of the nonlinear optical properties of BODIPY/carborane/diketopyrrolopyrrole hybrid chromophores: module contribution, linear combination, one-/two-dimensional difference and carborane's arrangement

2019 ◽  
Vol 7 (25) ◽  
pp. 7531-7547 ◽  
Author(s):  
Hong-Qiang Wang ◽  
Jin-Ting Ye ◽  
Yuan Zhang ◽  
Yuan-Yuan Zhao ◽  
Yong-Qing Qiu
Keyword(s):  
Optical Properties ◽  
Linear Combination ◽  
Nonlinear Optical ◽  
Nonlinear Optical Properties ◽  
Two Dimensional ◽  
Optical Applications ◽  
Nonlinear Optical Applications

The high modularity of multicomponent photoactive BODIPY/carborane/diketopyrrolopyrrole hybrid chromophores was explored for linear/nonlinear optical applications.

Structure-Optical Property Relationships of Porphyrins

1997 ◽  
Vol 479 ◽  
Author(s):  
Weijie Su ◽  
Thomas M. Cooper ◽  
Nansheng Tang ◽  
Doug Krein ◽  
Hao Jiang ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Optical Properties ◽  
Optical Property ◽  
Fluorescence Lifetimes ◽  
Structural Variations ◽  
Reduction Behavior ◽  
Oxidation Reduction ◽  
Optical Applications ◽  
The Relationship

AbstractPorphyrins are attractive compounds for optical applications. We have been investigating the relationship between molecular structure and optical properties of a number of porphyrin compounds. Structural variations explored include insertion of metal ions, extension of conjugation, halogenation and formation of multimers. The characterization of these chromophores includes measurement of UV/Vis, fluorescence and fluorescence lifetimes. Furthermore, we have investigated their nonlinear absorption, refraction, excitation dynamics as well as oxidation/reduction behavior. Based on our observations, clear recommendations can be made for the design of optical limiting chromophores.

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