Investigation of effective-medium models of microscopic surface roughness by spectroscopic ellipsometry

1979 ◽  
Vol 20 (8) ◽  
pp. 3292-3302 ◽  
Author(s):  
D. E. Aspnes ◽  
J. B. Theeten ◽  
F. Hottier
Keyword(s):  
Surface Roughness ◽  
Spectroscopic Ellipsometry ◽  
Effective Medium ◽  
Microscopic Surface ◽  
Effective Medium Models

Study of Ion Implanted Copper Laser Mirrors by Spectroscopic Ellipsometry

1986 ◽  
Vol 74 ◽  
Author(s):  
P. G. Snyder ◽  
A. Massengale ◽  
K. Memarzadeh ◽  
J. A. Woollam ◽  
D. C. Ingram ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Ion Implantation ◽  
Void Fraction ◽  
Spectroscopic Ellipsometry ◽  
Low Energy ◽  
Near Surface ◽  
Cu Ions ◽  
Microscopic Surface ◽  
Ion Implanted

AbstractImplantation with 400 keV Ag or Cu ions improves the near-surface microstructural quality and reflectance of diamond turned and mechanically polished flat copper laser mirrors. Spectroscopic ellipsometry is sensitive to changes in either the microscopic surface roughness, or in the nearsurface substrate void fraction, and both parameters are observed to change upon implantation. Substrate density as a function of ion fluence peaks at about 5 × 10 15cm-2. Low energy (300 eV) Ar ion implantation can cause either a reduction or increase in microscopic surface roughness, depending on fluence.

Using rock physics models to validate rock composition from multimineral log analysis

Geophysics ◽  
2021 ◽  
pp. 1-69
Author(s):  
Liwei Cheng ◽  
Manika Prasad ◽  
Reinaldo J. Michelena ◽  
Ali Tura ◽  
Shamima Akther ◽  
...  
Keyword(s):  
Quality Control ◽  
Reservoir Characterization ◽  
Rock Physics ◽  
Inequality Constraint ◽  
Effective Medium ◽  
Carbonate Reservoir ◽  
Log Analysis ◽  
Evaluation Tool ◽  
Rock Composition ◽  
Effective Medium Models

Multimineral log analysis is a quantitative formation evaluation tool for geological and petrophysical reservoir characterization. Rock composition can be estimated by solving equations that relate log measurements to the petrophysical endpoints of minerals and fluids. Due to errors in log data and uncertainties in petrophysical endpoints of constituents, we propose using effective medium models from rock physics as additional independent information to validate or constrain the results. In this paper, we examine the Voigt-Reuss (VR) bound model, self-consistent approximation (SCA), and differential effective medium (DEM). The VR bound model provides the first-order quality control of multimineral results. We first show a conventional carbonate reservoir study with intervals where the predicted effective medium models from multimineral results are inconsistent with the measured elastic properties. We use the VR bound model as an inequality constraint in multimineral analysis for plausible alternative solutions. SCA and DEM models provide good estimates in low porosity intervals and imply geological information for the porous intervals. Then, we show a field case of the Bakken and Three Forks formations. A linear interpolation of the VR bound model helps validate multimineral results and approximate the elastic moduli of clay. There are two major advantages to use our new method (a) rock physics effective medium models provide independent quality control of petrophysical multimineral results, and (b) multimineral information leads to realistic rock physics models.

New effective medium models and their applications

Vacuum ◽  
1995 ◽  
Vol 46 (8-10) ◽  
pp. 935-938 ◽  
Author(s):  
S Dligatch ◽  
MW Ng ◽  
GB Smith ◽  
AJ Reuben ◽  
AV Radchik ◽  
...  
Keyword(s):  
Effective Medium ◽  
Effective Medium Models

Cementation exponent as a geometric factor for the elastic properties of granular rocks

Geophysics ◽  
2020 ◽  
Vol 85 (6) ◽  
pp. MR341-MR349
Author(s):  
Tongcheng Han ◽  
Zhoutuo Wei ◽  
Li-Yun Fu
Keyword(s):  
Elastic Properties ◽  
Geophysical Methods ◽  
Effective Medium ◽  
Geometric Factor ◽  
Rock Properties ◽  
Modeling Approaches ◽  
The Earth ◽  
Elastic Rock ◽  
Effective Medium Models ◽  
Electromagnetic Surveys

A geometric factor properly describing the microstructure of a rock is compulsory for effective medium models to accurately predict the elastic and electrical rock properties, which, in turn, are of great importance for interpreting data acquired by seismic and electromagnetic surveys, two of the most important geophysical methods for understanding the earth. Despite the applications of cementation exponent for the successful modeling of electrical rock properties, however, there has been no demonstration of cementation exponent as the geometric factor for the elastic rock properties. We have developed a workflow to model the elastic properties of clean and normal granular rocks through the combination of effective medium modeling approaches using cementation exponent as the geometric factor. Based on the dedicated modeling approaches, we find that cementation exponent can be adequately used as a geometric factor for the elastic properties of granular rocks. Further results highlight the effects of cementation exponent on the elastic and joint elastic-electrical properties of granular rocks. The results illustrate the promise of cementation exponent as a geometric link for the joint elastic-electrical modeling to better characterize the earth through integrated seismic and electromagnetic surveys.

scholarly journals Surface roughness estimation of MBE grown CdTe/GaAs(211)B by ex-situ spectroscopic ellipsometry

AIP Advances ◽  
2016 ◽  
Vol 6 (7) ◽  
pp. 075111 ◽  
Author(s):  
Merve Karakaya ◽  
Elif Bilgilisoy ◽  
Ozan Arı ◽  
Yusuf Selamet
Keyword(s):  
Surface Roughness ◽  
Spectroscopic Ellipsometry ◽  
Ex Situ ◽  
Surface Roughness Estimation
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