Infra-Red Optical Properties Of Glasses And Ceramics For Hollow Waveguides Operating At 10.6 µm Wavelength

1987 ◽  
Author(s):  
Clive A. Worrell
Keyword(s):  
Optical Properties ◽  
Hollow Waveguides ◽  
Infra Red

Optical properties of a thin layer of the Vanadium dioxide at the metal state

2015 ◽  
Vol 9 (1) ◽  
pp. 2303-2310
Author(s):  
Abderrahim Benchaib ◽  
Abdesselam Mdaa ◽  
Izeddine Zorkani ◽  
Anouar Jorio
Keyword(s):  
Optical Properties ◽  
Thin Layer ◽  
Vanadium Dioxide ◽  
Ultra Violet ◽  
Index Of Refraction ◽  
Cost Of Energy ◽  
Infra Red ◽  
Metal State ◽  
The Cost ◽  
Reversible Phase

The vanadium dioxide VO₂ currently became very motivating for the nanotechnologies’ researchers. It makes party of the intelligent materials because these optical properties abruptly change semiconductor state with metal at a critical  temperature θ = 68°C. This transition from reversible phase is carried out from a monoclinical structure characterizing its semiconductor state at low temperature towards the metal state of this material which becomes tétragonal rutile for  θ ˃ 68°C ; it is done during a few nanoseconds. Several studies were made on this material in a massive state and a thin layer. We will simulate by Maple the constant optics of a thin layer of VO₂ thickness z = 82 nm for the metal state according to the energy ω of the incidental photons in the energy interval: 0.001242 ≤ ω(ev) ≤ 6, from the infra-red (I.R) to the ultra-violet (U.V) so as to be able to control the various technological nano applications, like the detectors I.R or the U.V,  the intelligent windows to  increase  the energy efficiency in the buildings in order to save the cost of energy consumption by electric air-conditioning and the paintings containing nano crystals of this material. The constant optics, which we will simulate, is: the index of refraction, the reflectivity, the transmittivity, the coefficient of extinction, the dielectric functions ԑ₁ real part and  ԑ₂  imaginary part of the permittivity complexes ԑ of this material and the coefficient absorption. 

Optical properties of the Vanadium dioxide

2015 ◽  
Vol 8 (2) ◽  
pp. 2148-2155 ◽  
Author(s):  
Abderrahim Benchaib ◽  
Abdesselam Mdaa ◽  
Izeddine Zorkani ◽  
Anouar Jorio
Keyword(s):  
Energy Efficiency ◽  
Optical Properties ◽  
Critical Temperature ◽  
Thin Layer ◽  
Dielectric Function ◽  
Vanadium Dioxide ◽  
Ultra Violet ◽  
Index Of Refraction ◽  
Practical Utility ◽  
Infra Red

The vanadium dioxide is a material thermo chromium which sees its optical properties changing at the time of the transition from the phase of semiconductor state ↔ metal, at a critical temperature of 68°C. The study of the optical properties of a thin layer of VO₂ thickness 82 nm, such as the dielectric function, the index of refraction, the coefficient ofextinction, the absorption’s coefficient, the reflectivity, the transmittivity, in the photonic spectrum of energy ω located inthe interval: 0.001242 ≤ ω (ev) ≤ 6, enables us to control well its practical utility in various applications, like the intelligentpanes, the photovoltaic, paintings for increasing energy efficiency in buildings, detectors of infra-red (I.R) or ultra-violet(U.V). We will make simulations with Maple and compare our results with those of the literature

Zn-rich staurolite from the Uvete area, central Kenya

1985 ◽  
Vol 49 (353) ◽  
pp. 573-578 ◽  
Author(s):  
Akira Miyake
Keyword(s):  
Optical Properties ◽  
Absorption Spectra ◽  
Optical Dispersion ◽  
Octahedral Sites ◽  
Tetrahedral Sites ◽  
Cell Dimensions ◽  
Infra Red ◽  
Central Kenya

AbstractZn-rich staurolite occurs in a pelitic gneiss from the Uvete area, central Kenya. The rock was metamorphosed to staurolite-kyanite grade during the Mozambique metamorphism. Microprobe analyses of the staurolite gave the following values (in wt. %): SiO2 26.2–27.3, Al2O3 52.4–53.5, FeO 8.3–9.2, MgO 2.2–2.6, and ZnO 6.0–7.5. Cell dimensions are a = 7.874(± 0.003), b = 16.620(±0.006), c = 5.656(±0.002) Å and β = 90.00 (± 0.002)°. Optical properties are 2Vz = 82–85°, α = 1.742 (±0.002), β = 1.747(±0.002) and γ = 1.753(±0.002). The optical dispersion is moderate and r > v. Density is 3.83(±0.01) g/cm3. Infra-red absorption spectra were also recorded. The cation correlation suggests that the principal substitutions in the staurolite are Zn ⇆ Fe in the tetrahedral sites in the hydroxide sheet and Al ⇆ Mg in the octahedral sites.

Iceberg Detection in Low Visibility Conditions via Infra-Red Sensors: Processing and Modelling of Field Data

2017 ◽  
Author(s):  
Grégory Bouquet ◽  
Helene Schulerud ◽  
Francesco Scibilia
Keyword(s):  
Optical Properties ◽  
Numerical Modelling ◽  
Field Data ◽  
Radiation Transfer ◽  
Short Wave ◽  
Long Wave ◽  
Infra Red ◽  
Low Visibility ◽  
Imaging Sensors ◽  
Modelling Study

This article deals with Short Wave Infra-Red (SWIR) and Long Wave Infra-Red (LWIR) imaging sensors for detecting icebergs in harsh metocean conditions. Field data acquired during the Statoil Offshore Newfoundland Research Expedition 2015 (ONRE15) is analyzed. The analysis is supported by a numerical modelling study which aims at simulating the optical properties of ice and water combined with the radiation transfer in the Infra Red.

scholarly journals Nature of intermolecular interaction in squaraine dimers

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Anna Kaczmarek-Kędziera ◽  
Piotr S. Żuchowski ◽  
Dariusz Kędziera
Keyword(s):  
Optical Properties ◽  
Perturbation Theory ◽  
Quantum Chemistry ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Detailed Knowledge ◽  
New Materials ◽  
Squaraine Dyes ◽  
Squaraine Dye ◽  
Infra Red

AbstractSquaraine dyes are known for their particular optical properties. They exhibit intense photochemically stable fluorescence in usually (near) infra red region that can be quenched by intermolecular interactions. Moreover, even the centrosymmetric dyes feature non-zero second harmonic generation upon aggregation. Therefore, the detailed knowledge of the squaraine dye interaction nature both in homogenic aggregates and with other species present in the environment can be of importance for the design of new materials of desired properties. In the present study, interaction in squaraine dimers is investigated with quantum chemistry tools. Four structures: two stacked and two hydrogen-bonded are analyzed in terms of supermolecular approach and symmetry-adapted perturbation theory. MP2C/aug-cc-pVTZ supermolecular calculations confirm the particular stability of the stacked dimers and the favoured dispersion attraction for the long-displaced system.

Optical theory of the echelette grating

1947 ◽  
Vol 43 (2) ◽  
pp. 240-253 ◽  
Author(s):  
G. K. T. Conn
Keyword(s):  
Optical Properties ◽  
Optical System ◽  
Wave Length ◽  
Practical Importance ◽  
Resolving Power ◽  
Relative Importance ◽  
Available Energy ◽  
Length Relationship ◽  
Infra Red ◽  
Echelette Grating

The optical properties of reflecting echelette gratings, used in the infra-red region of the spectrum, are discussed theoretically. Expressions are derived for various important characteristics including the wave-length relationship, the dispersion and the resolving power of spectrometers using such gratings. The intensity distribution is discussed and illustrated by reference to a particular spectrometer fitted with a grating of 1200 lines to the inch. The relative importance of other factors such as the variation of available energy with wave-length, the dispersion of the preliminary optical system, etc., is considered and tabulated. Particular consideration is given to the properties of such gratings when used in much higher orders of interference than are common at present. With large aperture spectrometers, this possibility of using comparatively coarse gratings with a high order of interference is of great practical importance.

Optical properties of dual-core hollow waveguides

1996 ◽  
Vol 35 (31) ◽  
pp. 6249 ◽  
Author(s):  
Christopher D. Rabii ◽  
James A. Harrington
Keyword(s):  
Optical Properties ◽  
Hollow Waveguides ◽  
Dual Core
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