The role of bandgap energy excess in surface emission of terahertz radiation from semiconductors

2017 ◽  
Vol 110 (4) ◽  
pp. 042101 ◽  
Author(s):  
M. Alfaro-Gomez ◽  
E. Castro-Camus
Keyword(s):  
Terahertz Radiation ◽  
Bandgap Energy ◽  
Surface Emission ◽  
Energy Excess

scholarly journals Investigation of the role of the lateral photo-Dember effect in the generation of terahertz radiation using a metallic mask on a semiconductor

2013 ◽  
Vol 21 (14) ◽  
pp. 16263 ◽  
Author(s):  
M. E. Barnes ◽  
S. A. Berry ◽  
P. Gow ◽  
D. McBryde ◽  
G. J. Daniell ◽  
...  
Keyword(s):  
Terahertz Radiation ◽  
Dember Effect

scholarly journals Role of resonance absorption in terahertz radiation generation from solid targets

2014 ◽  
Vol 22 (10) ◽  
pp. 11797 ◽  
Author(s):  
Chun Li ◽  
Yun-Qian Cui ◽  
Mu-Lin Zhou ◽  
Fei Du ◽  
Yu-Tong Li ◽  
...  
Keyword(s):  
Terahertz Radiation ◽  
Resonance Absorption ◽  
Radiation Generation

On the role of photoionization in generation of terahertz radiation in the plasma of optical breakdown

2012 ◽  
Vol 29 (8) ◽  
pp. 1911 ◽  
Author(s):  
Alexander V. Borodin ◽  
Mikhail N. Esaulkov ◽  
Ilya I. Kuritsyn ◽  
Igor A. Kotelnikov ◽  
Alexander P. Shkurinov
Keyword(s):  
Terahertz Radiation ◽  
Optical Breakdown

scholarly journals Unravelling the interfacial interaction in mesoporous SiO2@nickel phyllosilicate/TiO2 core–shell nanostructures for photocatalytic activity

2020 ◽  
Vol 11 ◽  
pp. 1834-1846
Author(s):  
Bridget K Mutuma ◽  
Xiluva Mathebula ◽  
Isaac Nongwe ◽  
Bonakele P Mtolo ◽  
Boitumelo J Matsoso ◽  
...  
Keyword(s):  
Methyl Violet ◽  
Optoelectronic Properties ◽  
Shell Morphology ◽  
Bandgap Energy ◽  
Core Shell ◽  
The Core ◽  
Shell Nanostructures ◽  
Carrier Separation ◽  
First Time

Core–shell based nanostructures are attractive candidates for photocatalysis owing to their tunable physicochemical properties, their interfacial contact effects, and their efficacy in charge-carrier separation. This study reports, for the first time, on the synthesis of mesoporous silica@nickel phyllosilicate/titania (mSiO2@NiPS/TiO2) core–shell nanostructures. The TEM results showed that the mSiO2@NiPS composite has a core–shell nanostructure with a unique flake-like shell morphology. XPS analysis revealed the successful formation of 1:1 nickel phyllosilicate on the SiO2 surface. The addition of TiO2 to the mSiO2@NiPS yielded the mSiO2@NiPS/TiO2 composite. The bandgap energy of mSiO2@NiPS and of mSiO2@NiPS/TiO2 were estimated to be 2.05 and 2.68 eV, respectively, indicating the role of titania in tuning the optoelectronic properties of the SiO2@nickel phyllosilicate. As a proof of concept, the core–shell nanostructures were used as photocatalysts for the degradation of methyl violet dye and the degradation efficiencies were found to be 72% and 99% for the mSiO2@NiPS and the mSiO2@NiPS/TiO2 nanostructures, respectively. Furthermore, a recyclability test revealed good stability and recyclability of the mSiO2@NiPS/TiO2 photocatalyst with a degradation efficacy of 93% after three cycles. The porous flake-like morphology of the nickel phyllosilicate acted as a suitable support for the TiO2 nanoparticles. Further, a coating of TiO2 on the mSiO2@NiPS surface greatly affected the surface features and optoelectronic properties of the core–shell nanostructure and yielded superior photocatalytic properties.

Role of pulse shaping in control of focus and intensity of terahertz radiation

2019 ◽  
Vol 383 (24) ◽  
pp. 2891-2896 ◽  
Author(s):  
Reenu Gill ◽  
Hitendra K. Malik
Keyword(s):  
Terahertz Radiation ◽  
Pulse Shaping

scholarly journals The role of optical rectification in the generation of terahertz radiation from GaBiAs

2009 ◽  
Vol 94 (25) ◽  
pp. 251115 ◽  
Author(s):  
K. Radhanpura ◽  
S. Hargreaves ◽  
R. A. Lewis ◽  
M. Henini
Keyword(s):  
Terahertz Radiation ◽  
Optical Rectification

scholarly journals The role of mitochondrial energetics in the origin and diversification of eukaryotes

2021 ◽  
Author(s):  
Paul E Schavemaker ◽  
Sergio A Munoz-Gomez
Keyword(s):  
Cell Surface ◽  
Surface Area ◽  
Energy Demand ◽  
Common Ancestor ◽  
Eukaryotic Cell ◽  
Cell Surfaces ◽  
Energy Excess ◽  
Potential Factors ◽  
Cell Volumes

The origin of eukaryotic cell size and complexity is thought by some to have required an energy excess provided by mitochondria, whereas others claim that mitochondria provide no energetic boost to eukaryotes. Recent observations show that energy demand scales continuously and linearly with cell volume across both prokaryotes and eukaryotes, and thus suggest that eukaryotes do not have an increased energetic capacity over prokaryotes. However, amounts of respiratory membranes and ATP synthases scale super-linearly with cell surface area. Furthermore, the energetic consequences of the contrasting genomic designs between prokaryotes and eukaryotes have yet to be precisely quantified. Here, we investigated (1) potential factors that affect the cell volumes at which prokaryotes become surface area-constrained, and (2) the amount of energy that is divested to increasing amounts of DNA due to the contrasting genomic designs of prokaryotes and eukaryotes. Our analyses suggest that prokaryotes are not necessarily constrained by their cell surfaces at cell volumes of 100-103 µm3, and that the genomic design of eukaryotes is only slightly advantageous at genomes sizes of 106-107 bp. This suggests that eukaryotes may have first evolved without the need for mitochondria as these ranges hypothetically encompass the Last Eukaryote Common Ancestor and its proto-eukaryotic ancestors. However, our analyses also show that increasingly larger and fast-dividing prokaryotes would have a shortage of surface area devoted to respiration and would disproportionally divest more energy to DNA synthesis at larger genome sizes. We thus argue that, even though mitochondria may not have been required by the first eukaryotes, the successful diversification of eukaryotes into larger and more active cells was ultimately contingent upon the origin of mitochondria.

scholarly journals Optical, Thermal and Radiation Shielding Properties of B2O3 - NaF - PbO – BaO - La2O3 Glasses

2021 ◽  
Author(s):  
Kh. S. Shaaban
Keyword(s):  
Thermal Characteristics ◽  
Glass Network ◽  
Radiation Shielding ◽  
Bandgap Energy ◽  
Optical Parameters ◽  
Molar Polarizability ◽  
Non Linear ◽  
Optical Bandgap Energy ◽  
Xrd Patterns

Abstract The techniques of melt-quenching were used to generate 53B2O3 - 2NaF - 27PbO – (20 - x)BaO - La2O3 (0 ≤ x ≥ 15) glass system. XRD patterns have established the amorphous character of glass samples. There is clear evidence of the role of La2O3 modifier in the glass network. The thermal characteristics were identified to increase with an increase in La2O3 content. Increasing La2O3 increases the linear and non-linear optical bandgap energy and the Urbach energy. By adding La2O3 to the glass samples, the refractive index, molar polarizability, polarizability, and optical basicity are increased. Theoretically, the bulk modulus and the glass transition temperature increase because of the increase in bond strength. The number of bonds per unit increased with the increase in La2O3 content because of the modifier character of La2O3 in the glass samples. Multiple optical parameters (ε∞), (εo), X(1), (X(3)) and (n2) as a function of linear and non-linear Eopt were obtained. The extent of shielding in this article was examined with the increment in La2O3 at the expense of BaO. The results correspond with similar studies conducted previously.

Sign in / Sign up

Export Citation Format

Share Document