Cadmium tin phosphide (CdSnP2) optical properties, dielectric constants, refractive index

2005 ◽  
pp. 1-6
Author(s):  
Keyword(s):  
Refractive Index ◽  
Optical Properties ◽  
Dielectric Constants ◽  
Tin Phosphide

Uniaxial Strain and Optical properties of GaP Nanowires

2020 ◽  
Vol 8 (2) ◽  
pp. 131-142
Author(s):  
Rezek Mohammad
Keyword(s):  
Refractive Index ◽  
Optical Properties ◽  
High Speed ◽  
Density Functional ◽  
Threshold Energy ◽  
Dielectric Constants ◽  
Uniaxial Strain ◽  
Full Potential ◽  
Cross Sectional ◽  
Optical Functions

The optical properties for wurtzite (WZ) Bulk GaP and GaP nanowires (GaP-NWs) in hexagonal(circular), triangular and square cross sectional are investigated by using full potential linear augmented plane waves and local orbitals (FP-LAPW-LO) method based on density functional theory (DFT). The wurtzite nanowires are investigated with diameters limited to ~27 oA. The optical functions  as a function of photon energy have been investigated for unstrained bulk WZ-GaP and WZ-GaP-NWs in the first part. Finally, the optical functions are investigated for WZ-GaP-NWs by applying uniaxial strain from -5% to +5%. The effect of cross sectional variation in the area and shape of the NWs on the optical functions is clear when compared with bulk GaP. GaP-NWs kept real dielectric constant  positive and refractive index  close to vacuum value for a wider range of energy on the contrary of bulk GaP. It is found that the dielectric constants  are slightly increased from the unstrained GaP-NWs values with strain increases. A shift in the threshold energy for  toward higher energy as the strain changes from tensile to compressive. The refractive index  shows a small change when passing from compressive toward tensile strain. It is found that GaP-NWs could play a role in solar cells structure and high speed electronic circuits.

Uniaxial Strain and Optical properties of GaP Nanowires

2020 ◽  
Vol 8 (2) ◽  
pp. 131-142
Author(s):  
Rezek Mohammad
Keyword(s):  
Refractive Index ◽  
Optical Properties ◽  
High Speed ◽  
Density Functional ◽  
Threshold Energy ◽  
Dielectric Constants ◽  
Uniaxial Strain ◽  
Full Potential ◽  
Cross Sectional ◽  
Optical Functions

The optical properties for wurtzite (WZ) Bulk GaP and GaP nanowires (GaP-NWs) in hexagonal(circular), triangular and square cross sectional are investigated by using full potential linear augmented plane waves and local orbitals (FP-LAPW-LO) method based on density functional theory (DFT). The wurtzite nanowires are investigated with diameters limited to ~27 oA. The optical functions  as a function of photon energy have been investigated for unstrained bulk WZ-GaP and WZ-GaP-NWs in the first part. Finally, the optical functions are investigated for WZ-GaP-NWs by applying uniaxial strain from -5% to +5%. The effect of cross sectional variation in the area and shape of the NWs on the optical functions is clear when compared with bulk GaP. GaP-NWs kept real dielectric constant  positive and refractive index  close to vacuum value for a wider range of energy on the contrary of bulk GaP. It is found that the dielectric constants  are slightly increased from the unstrained GaP-NWs values with strain increases. A shift in the threshold energy for  toward higher energy as the strain changes from tensile to compressive. The refractive index  shows a small change when passing from compressive toward tensile strain. It is found that GaP-NWs could play a role in solar cells structure and high speed electronic circuits.

scholarly journals Structural and optical properties for PVA- PEG-MnCl2 composites

2019 ◽  
Vol 15 (32) ◽  
pp. 99-113
Author(s):  
Mahdi Hasan Suhail
Keyword(s):  
Refractive Index ◽  
Optical Properties ◽  
Polymer Blend ◽  
Extinction Coefficient ◽  
Energy Gap ◽  
Dielectric Constants ◽  
Structural And Optical Properties ◽  
Optical Energy Gap ◽  
X Ray ◽  
Amorphous Structures

Polymer films of PEG and PVA and their blend with differentconcentrations of MnCl2 (0, 2, 4, 6 and 10 %.wt) were study usingcasting technique. The X-ray spectra of pure PEG, PVA andPVA:PEG films and with addition of 2% concentrations from(MnCl2) show amorphous structures. The results for FTIR show theinteraction between the filler and polymer blend results indecreasing crystallinity with rich amorphous phase. Thisamorphous nature confirms the complexation between the filler andthe polymer blend. The optical properties of (PVA:PEG/MnCl2)contain the recording of absorbance (A) and explain that theabsorption coefficient (α), refractive index (n), extinction coefficient(ko) and the dielectric constants (real and imaginary part) increasewith increasing the concentration of Composite (PVA:PEG/MnCl2).The optical energy gap for electrons transitions both are direct andindirect allowed.

scholarly journals Tuning the Refractive Index and Optical Band Gap of Silk Fibroin Films by Electron Irradiation

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
S. Asha ◽  
Y. Sangappa ◽  
Sanjeev Ganesh
Keyword(s):  
Refractive Index ◽  
Optical Properties ◽  
Band Gap ◽  
Silk Fibroin ◽  
Structural Changes ◽  
Optical Band Gap ◽  
Dielectric Constants ◽  
Visible Absorption ◽  
Optical Responses ◽  
Uv Visible

TheBombyx morisilk fibroin (SF) films were prepared by solution casting method and effects of electron beam on the optical properties and optical constants of the films have been studied by using UV-Visible spectrophotometer. Optical properties like optical band gapEg, refractive indexn, extinction coefficientk, optical conductivityσopt, and dielectric constantsε∗of virgin and electron irradiated films were determined by using UV-Visible absorption and transmission spectra. It was found that the reduction in optical band gap and increase in refractive index with increasing radiation dosage was observed. It is also observed from results that there is increase in dielectric constants with increasing photon energy. The observed optical changes have been tried to be correlated with the structural changes, revealed through FT-IR spectroscopy. The present study is quite important for tailoring the optical responses of SF films as per specific requirements.

FP-LMTO study of structural, electronic, thermodynamic and optical properties of MgxCd1−x Se alloys

2014 ◽  
Vol 32 (4) ◽  
pp. 719-728 ◽  
Author(s):  
D. Bensaid ◽  
M. Ameri ◽  
M. El Hanani ◽  
Y. Azaz ◽  
D. Bendouma ◽  
...  
Keyword(s):  
Refractive Index ◽  
Optical Properties ◽  
Band Gap ◽  
Density Functional ◽  
Molar Fraction ◽  
Dielectric Constants ◽  
Ternary Alloys ◽  
Wide Range ◽  
Direct Band ◽  
Extraordinary Refractive Index

AbstractStructural, electronic and optical properties of MgxCd1−x Se (0 ≤ x ≤ 1) are calculated for the first time using density functional theory. Our results show that these properties are strongly dependent on molar fraction of particular components — x. The bond between Cd and Se is partially covalent and the covalent nature of the bond decreases as the concentration of Mg increases from 0 % to 100 %. It is found that MgxCd1−x Se has a direct band gap in the entire range of x and the band gap of the alloy increases from 0.43 to 2.46 eV with the increase in Mg concentration. Frequency dependent dielectric constants ɛ1(ω), ɛ2(ω) refractive index n(ω) are also calculated and discussed in detail. The peak value of refractive indices shifts to higher energy regions with the increase in Mg. The larger value of the extraordinary refractive index confirms that the material is a positive birefringence crystal. The present comprehensive theoretical study of the optoelectronic properties of the material predicts that it can be effectively used in optoelectronic applications in the wide range of spectra: IR, visible and UV. In addition, we have also predicted the heat capacities (CV), the entropy (S), the internal energy (U) and the Helmholtz free energy (F) of MgxCd1−x Se ternary alloys.

scholarly journals Study of the Effect of Berry Paper Mulberry on Optical Properties of Poly Methyl Methacrylate

2014 ◽  
Vol 11 (2) ◽  
pp. 695-701
Author(s):  
Baghdad Science Journal
Keyword(s):  
Refractive Index ◽  
Optical Properties ◽  
Methyl Methacrylate ◽  
Optical Constants ◽  
Energy Gap ◽  
Dielectric Constants ◽  
Work Study ◽  
Casting Method ◽  
Poly Methyl Methacrylate ◽  
Properties Of Composites

In this work, study the optical properties of composites consisting of poly Methyl Methacrylate and Berry Paper Mulberry. The samples of composites were prepared using casting method .The Berry Paper Mulberry (BPM) was added by different concentrations are (0, 2, 4 and 6)wt.%. The optical properties of composites have been studied in the wavelength range (200-800)nm. The absorption coefficient ,energy gap, refractive index, extinction coefficient and dielectric constants have been determined. The results show that the optical constants change with increase of BPM concentrations .

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