On determining the optical properties and layer structure from spectroscopic ellipsometric data using automated artifact minimization method

2014 ◽  
Vol 567 ◽  
pp. 14-19 ◽  
Author(s):  
J. Budai ◽  
B. Farkas ◽  
Z.L. Horváth ◽  
Zs. Geretovszky
Keyword(s):  
Optical Properties ◽  
Layer Structure ◽  
Minimization Method

scholarly journals Моды волновода с пороговой нелинейностью

2020 ◽  
Vol 46 (16) ◽  
pp. 43
Author(s):  
С.Е. Савотченко
Keyword(s):  
Dielectric Constant ◽  
Optical Properties ◽  
Surface Waves ◽  
Nonlinear Optical ◽  
Layer Structure ◽  
Finite Thickness ◽  
Critical Value ◽  
Field Structure ◽  
Finite Width ◽  
Border Regions

A three-layer structure consisting of a nonlinear optical medium with a stepwise change in the dielectric constant inside which there is a dielectric layer of finite thickness is considered. The surface waves of two types of symmetry with a special field structure can propagate along the layers. Domains of finite width with different optical properties in the border regions in a nonlinear medium are formed. The formation of domains, as well as the existence of surface waves, occurs at interlayer thicknesses not exceeding a certain critical value.

An investigation of angle-dependent optical properties of multi-layer structure pigments formed by metal-oxide-coated mica

2008 ◽  
Vol 185 (3) ◽  
pp. 291-296 ◽  
Author(s):  
Haiyan Du ◽  
Caixia Liu ◽  
Jiayue Sun ◽  
Qirong Chen
Keyword(s):  
Optical Properties ◽  
Metal Oxide ◽  
Layer Structure

Wet-Chemical Processing and Angle-Dependent Optical Properties Characterization of Mica/TiO2/Al2O3/M2O3 (M = Fe, Cr, Co) Pigments

2010 ◽  
Vol 663-665 ◽  
pp. 1053-1056
Author(s):  
Hai Yan Du ◽  
Cai Xia Liu ◽  
Jia Yue Sun
Keyword(s):  
Optical Properties ◽  
Metal Ions ◽  
Spectral Reflectance ◽  
Layer Structure ◽  
Chemical Processing ◽  
Color Changes ◽  
Optical Effects ◽  
Coating Method ◽  
Wet Chemical

The four-layer structure angle-dependent pigments with compositions of Mica/TiO2 /Al2O3/Fe2O3, Mica/TiO2/Al2O3/Cr2O3 and Mica/TiO2/Al2O3/Co2O3 were firstly prepared by the wet-chemical coating method, respectively. The as-prepared pigments were performed by precipitating different metal ions, such as Cr3+, Fe3+, Co2+and Al3+, on the pretreated substrates, mica titanium. The optical effects of four-layer structure pigments were investigated in detail by using the five angles’ spectrophotometer. The angle-dependent spectral reflectance and color changes can be quantitatively measured, and the results show that the angle-dependent effects for the as-prepared pigment were improved by the increasing coated Al2O3 layers.

scholarly journals Ellipsometric Diagnostics of a Transient Surface Layer in Optical Glass

2019 ◽  
Vol 64 (5) ◽  
pp. 442 ◽  
Author(s):  
O. V. Makarenko ◽  
L. V. Poperenko ◽  
O. I. Zavalistyi ◽  
A. L. Yampolskiy
Keyword(s):  
Optical Properties ◽  
Surface Layer ◽  
Layer Structure ◽  
Optical Glass ◽  
Target Function ◽  
Morphological Structure ◽  
Thin Layers ◽  
Inhomogeneous Surface ◽  
Interference Phenomenon ◽  
Near Surface

Optical properties of a transient layer with a broken structure that arises at the surface of optical glass at its treatment have been considered. Rather often, the surface of optical elements is considered to be perfect, although the actual inhomogeneous surface structure can have a significant effect for precision physical experiments or novel technological problems. Furthermore, the simulation of the surface layer structure and the corresponding optical characteristics, as well as the study of a possibility to determine those parameters from the results of optical researches, is also of theoretical interest, which is demonstrated in this work. Ellipsometric measurements of optical glass specimens with a broken surface layer are carried out. When modeling the angular dependences of the ellipsometric parameters tan ф and cos б, the near-surface specimen region is considered as a stack of 500 thin layers, and the matrix method of light reflection in this structure with regard for the interference phenomenon is used in calculations. Five models are tested for the optical profile of a nonuniform layer, whose parameters are fitted to achieve the minimum of the target function describing the discrepancy between the calculated and measured data. It is found that the theoretical models describe the optical properties of the specimens more accurately, if they make allowance for the inhomogeneous surface layer. Nevertheless, the solution of the inverse ellipsometric problem turns out ambiguous, so that additional measurements are required for the final choice of a model that would be adequate to the actual morphological structure of the broken layer to be made. However, the key advantage of the applied method consists in that it allows a direct registration of the optical response of the system.

scholarly journals Function of blue iridescence in tropical understorey plants

2010 ◽  
Vol 7 (53) ◽  
pp. 1699-1707 ◽  
Author(s):  
Katherine R. Thomas ◽  
Mathias Kolle ◽  
Heather M. Whitney ◽  
Beverley J. Glover ◽  
Ullrich Steiner
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Optical Properties ◽  
Lamellar Structure ◽  
Layer Structure ◽  
Green Leaves ◽  
Transmission Electron ◽  
Layer Structures ◽  
Understorey Plants ◽  
Light Capture

The blue colouration seen in the leaves of Selaginella willdenowii is shown to be iridescent. Transmission electron microscopy studies confirm the presence of a layered lamellar structure of the upper cuticle of iridescent leaves. Modelling of these multi-layer structures suggests that they are responsible for the blue iridescence, confirming the link between the observed lamellae and the recorded optical properties. Comparison of blue and green leaves from the same plant indicates that the loss of the blue iridescence corresponds to a loss of the multi-layer structure. The results reported here do not support the idea that iridescence in plants acts to enhance light capture of photosynthetically important wavelengths. The reflectance of light in the range 600–700 nm is very similar for both iridescent and non-iridescent leaves. However, owing to the occurrence of blue colouration in a wide variety of shade dwelling plants it is probable that this iridescence has some adaptive benefit. Possible adaptive advantages of the blue iridescence in these plants are discussed.

scholarly journals Terahertz Conductivity of Silver Nanowire Layers

2021 ◽  
Author(s):  
Aleksandra Przewloka ◽  
Serguei Smirnov ◽  
Irina Nefedova ◽  
Aleksandra Krajewska ◽  
Igor Nefedov ◽  
...  
Keyword(s):  
Optical Properties ◽  
Wireless Communication ◽  
Layer Structure ◽  
Silver Nanowires ◽  
Silver Nanowire ◽  
Frequency Range ◽  
Electrical And Optical Properties ◽  
Conductive Coatings ◽  
Communication Devices ◽  
Metal Nanowire

Abstract We present the study of the influence of different thin silver nanowire layers on electrical and optical properties in the Terahertz (THz) frequency range. We demonstrate that the absorbance, transmittance and reflectance of the metal nanowire layers in the frequency range of 0.2~THz to 1.2~THz is non-monotonic and depends on the nanowire dimensions and density. We present and validate also a theoretical approach describing well the experimental results and allowing to model the THz response as function the nanowire layer structure. Our results pave the way toward the application of silver nanowires as a perspective material for transparent and conductive coatings, and printable antennas operating in the terahertz range – significant for future wireless communication devices.

scholarly journals Optical properties of long-range transported Saharan dust over Barbados as measured by dual-wavelength depolarization Raman lidar measurements

2015 ◽  
Vol 15 (19) ◽  
pp. 11067-11080 ◽  
Author(s):  
S. Groß ◽  
V. Freudenthaler ◽  
K. Schepanski ◽  
C. Toledano ◽  
A. Schäfler ◽  
...  
Keyword(s):  
Optical Properties ◽  
Aerosol Optical Depth ◽  
Long Range ◽  
Optical Depth ◽  
Layer Structure ◽  
Dual Wavelength ◽  
Saharan Dust ◽  
Dust Layer ◽  
Mean Values ◽  
532 Nm

Abstract. Dual-wavelength Raman and depolarization lidar observations were performed during the Saharan Aerosol Long-range Transport and Aerosol-Cloud interaction Experiment in Barbados in June and July 2013 to characterize the optical properties and vertical distribution of long-range transported Saharan dust after transport across the Atlantic Ocean. Four major dust events were studied during the measurements from 15 June to 13 July 2013 with aerosol optical depths at 532 nm of up to 0.6. The vertical aerosol distribution was characterized by a three-layer structure consisting of the boundary layer, the entrainment or mixing layer and the pure Saharan dust layer. The upper boundary of the pure dust layer reached up to 4.5 km in height. The contribution of the pure dust layer was about half of the total aerosol optical depth at 532 nm. The total dust contribution was about 50–70 % of the total aerosol optical depth at 532 nm. The lidar ratio within the pure dust layer was found to be wavelength independent with mean values of 53 ± 5 sr at 355 nm and 56 ± 7 sr at 532 nm. For the particle linear depolarization ratio, wavelength-independent mean values of 0.26 ± 0.03 at 355 nm and 0.27 ± 0.01 at 532 nm have been found.

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