Determination of absorption coefficient of nanofluids with unknown refractive index from reflection and transmission spectra

2018 ◽  
Vol 213 ◽  
pp. 107-112 ◽  
Author(s):  
Joong Bae Kim ◽  
Seungyoon Lee ◽  
Kyungeun Lee ◽  
Ikjin Lee ◽  
Bong Jae Lee
Keyword(s):  
Refractive Index ◽  
Absorption Coefficient ◽  
Transmission Spectra ◽  
Reflection And Transmission

Optical Properties of Ge23.5Pb20S56.5 Glassy System

2016 ◽  
Vol 723 ◽  
pp. 522-526
Author(s):  
Nadezhda Ivanovna Anisimova ◽  
Gennady Alekseevich Bordovsky ◽  
Rene Alejandro Castro ◽  
Lilia Ansafovna Nabiullina
Keyword(s):  
Thin Films ◽  
Refractive Index ◽  
Absorption Coefficient ◽  
Room Temperature ◽  
Fundamental Absorption Edge ◽  
Transmission Spectra ◽  
Glassy System ◽  
Static Structure ◽  
Structure Disorder ◽  
Disorder Parameter

The spectra of refractive index and absorption coefficient in thin films of Ge23.5Pb20S56.5 glassy system were calculated on the base of analysis of transmission spectra. The refractive index has values between 2.0 and 2.6 in the spectral range between 500 nm and 1200 nm. The existence of indirect allowed transitions with energy Eg = 1.70 ± 0.01 eV and phonon energy of wph= 0.11 eV at room temperature was found. For values of the absorption coefficient a < 103см –1 the fundamental absorption edge is described by exponential function known as Urbach-rule. The static structure disorder parameter wo, is equal to 0.06 eV.

scholarly journals RECORDING TECHNIQUE OF MASKS ON MULTILAYERED COATINGS (Part 1)

2019 ◽  
Vol 8 ◽  
pp. 47-51 ◽  
Author(s):  
Nikita Gurin ◽  
Viktor Korolkov ◽  
Yury Batomunkuev ◽  
Evgeny Spesivtsev
Keyword(s):  
Experimental Study ◽  
Refractive Index ◽  
Laser Radiation ◽  
Absorption Coefficient ◽  
Chromium Oxide ◽  
Visible Spectral Region ◽  
Reflection And Transmission ◽  
Recording Technique ◽  
Multilayered Coatings ◽  
Transmission Coefficients

The aim of the work is an experimental study of the optical characteristics of chromium oxide films, such as the refractive index, absorption coefficient, reflection and transmission coefficients for the visible spectral region. This work is a part of the development of a mask writing technique with focused laser radiation on multilayer absorbing coatings.

SOLVENT EFFECTS IN THE DETERMINATION OF THE NONLINEAR OPTICAL PROPERTIES

2008 ◽  
Vol 17 (04) ◽  
pp. 511-520 ◽  
Author(s):  
A. MENDOZA-GARCÍA ◽  
J. L. PAZ ◽  
M. GORAYEB ◽  
A. J. HERNÁNDEZ ◽  
E. CASTRO ◽  
...  
Keyword(s):  
Refractive Index ◽  
Optical Properties ◽  
Probability Distribution ◽  
Absorption Coefficient ◽  
Solvent Effects ◽  
High Intensity ◽  
Signal Intensity ◽  
Nonlinear Optical ◽  
Molecular System

The interaction between a two-level molecular system and a high intensity electric field under the influence of a solvent was analyzed through the OSBE. To solve these equations, the average of the coherence was performed, using a generalized Lorentzian approximation for the Voigt's function as a probability distribution. Applying the convolution theorem, we were able to find an analytical expression for the coherence, from which we calculate optical properties, such as the absorption coefficient, refractive index and emitted signal intensity. In this contribution, we show numerical results for these properties, calculated for a standard model of organic colorants, Green Malaquite.

Optical Constant Determination of Thin Polymer Films in the Infrared

1985 ◽  
Vol 39 (3) ◽  
pp. 405-408 ◽  
Author(s):  
R. T. Graf ◽  
J. L. Koenig ◽  
H. Ishida
Keyword(s):  
Refractive Index ◽  
Optical Constant ◽  
Infrared Region ◽  
Transmission Spectra ◽  
Thin Polymer Films ◽  
Interference Fringes ◽  
Constant Determination ◽  
Thin Polymer ◽  
Good Agreement

Thin films of poly(vinyl chloride), poly(methyl methacrylate), and poly(styrene) were analyzed by Fourier transform infrared spectroscopy. The interference fringes present in the transmission spectra of these samples were used to determine film thickness and average refractive index. Subsequent Kramers-Kronig analysis of these transmission spectra provided the dispersion of the refractive index and the absorption index across the entire mid-infrared region. Interference fringes were absent in the optical constant spectra, and good agreement was obtained between our optical constant spectra and those of other authors.

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