Three-Dimensional Photorefractive Signal Processing In Bismuth Silicon Oxide

1986 ◽  
Author(s):  
John M. Pellegrino ◽  
John R. Goff
Keyword(s):  
Signal Processing ◽  
Silicon Oxide ◽  
Three Dimensional ◽  
Bismuth Silicon Oxide

scholarly journals Mastering of NIL Stamps with Undercut T-Shaped Features from Single Layer to Multilayer Stamps

Nanomaterials ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 956
Author(s):  
Philipp Taus ◽  
Adrian Prinz ◽  
Heinz D. Wanzenboeck ◽  
Patrick Schuller ◽  
Anton Tsenov ◽  
...  
Keyword(s):  
Electron Beam Lithography ◽  
Nanoimprint Lithography ◽  
Silicon Oxide ◽  
Three Dimensional ◽  
Single Layer ◽  
Fabrication Technology ◽  
Large Area ◽  
Structural Colors ◽  
Biomimetic Structures ◽  
Morpho Butterfly

Biomimetic structures such as structural colors demand a fabrication technology of complex three-dimensional nanostructures on large areas. Nanoimprint lithography (NIL) is capable of large area replication of three-dimensional structures, but the master stamp fabrication is often a bottleneck. We have demonstrated different approaches allowing for the generation of sophisticated undercut T-shaped masters for NIL replication. With a layer-stack of phase transition material (PTM) on poly-Si, we have demonstrated the successful fabrication of a single layer undercut T-shaped structure. With a multilayer-stack of silicon oxide on silicon, we have shown the successful fabrication of a multilayer undercut T-shaped structures. For patterning optical lithography, electron beam lithography and nanoimprint lithography have been compared and have yielded structures from 10 µm down to 300 nm. The multilayer undercut T-shaped structures closely resemble the geometry of the surface of a Morpho butterfly, and may be used in future to replicate structural colors on artificial surfaces.

scholarly journals Prospects of the WSR-88D Radar for Cloud Studies

2011 ◽  
Vol 50 (4) ◽  
pp. 859-872 ◽  
Author(s):  
Valery M. Melnikov ◽  
Dusan S. Zrnić ◽  
Richard J. Doviak ◽  
Phillip B. Chilson ◽  
David B. Mechem ◽  
...  
Keyword(s):  
Signal Processing ◽  
Real Time ◽  
Three Dimensional ◽  
High Sensitivity ◽  
Doppler Velocity ◽  
Cloud Data ◽  
Three Dimensional Mapping ◽  
Spectrum Width ◽  
Differential Reflectivity ◽  
Dimensional Mapping

AbstractSounding of nonprecipitating clouds with the 10-cm wavelength Weather Surveillance Radar-1988 Doppler (WSR-88D) is discussed. Readily available enhancements to signal processing and volume coverage patterns of the WSR-88D allow observations of a variety of clouds with reflectivities as low as −25 dBZ (at a range of 10 km). The high sensitivity of the WSR-88D, its wide velocity and unambiguous range intervals, and the absence of attenuation allow accurate measurements of the reflectivity factor, Doppler velocity, and spectrum width fields in clouds to ranges of about 50 km. Fields of polarimetric variables in clouds, observed with a research polarimetric WSR-88D, demonstrate an abundance of information and help to resolve Bragg and particulate scatter. The scanning, Doppler, and polarimetric capabilities of the WSR-88D allow real-time, three-dimensional mapping of cloud processes, such as transformations of hydrometeors between liquid and ice phases. The presence of ice particles is revealed by high differential reflectivities and the lack of correlation between reflectivity and differential reflectivity in clouds in contrast to that found for rain. Pockets of high differential reflectivities are frequently observed in clouds; maximal values of differential reflectivity exceed 8 dB, far above the level observed in rain. The establishment of the WSR-88D network consisting of 157 polarimetric radars can be used to collect cloud data at any radar site, making the network a potentially powerful tool for climatic studies.

scholarly journals Pattern-Dependent Mammalian Cell (Vero) Morphology on Tantalum/Silicon Oxide 3D Nanocomposites

Materials ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 1306 ◽  
Author(s):  
Hassan Moussa ◽  
Megan Logan ◽  
Wing Chan ◽  
Kingsley Wong ◽  
Zheng Rao ◽  
...  
Keyword(s):  
Mammalian Cell ◽  
Silicon Oxide ◽  
Significant Proportion ◽  
Three Dimensional ◽  
Vero Cells ◽  
Nanocomposite Materials ◽  
Effective Diameter ◽  
Tantalum Films ◽  
Fine Structures ◽  
Scanning Electron

The primary goal of this work was to investigate the resulting morphology of a mammalian cell deposited on three-dimensional nanocomposites constructed of tantalum and silicon oxide. Vero cells were used as a model. The nanocomposite materials contained comb structures with equal-width trenches and lines. High-resolution scanning electron microscopy and fluorescence microscopy were used to image the alignment and elongation of cells. Cells were sensitive to the trench widths, and their observed behavior could be separated into three different regimes corresponding to different spreading mechanism. Cells on fine structures (trench widths of 0.21 to 0.5 μm) formed bridges across trench openings. On larger trenches (from 1 to 10 μm), cells formed a conformal layer matching the surface topographical features. When the trenches were larger than 10 μm, the majority of cells spread like those on blanket tantalum films; however, a significant proportion adhered to the trench sidewalls or bottom corner junctions. Pseudopodia extending from the bulk of the cell were readily observed in this work and a minimum effective diameter of ~50 nm was determined for stable adhesion to a tantalum surface. This sized structure is consistent with the ability of pseudopodia to accommodate ~4–6 integrin molecules.

Bismuth silicon oxide as a holographic storage medium

1992 ◽  
Author(s):  
Charles L. Eads ◽  
Azad Siahmakoun ◽  
Arthur B. Western
Keyword(s):  
Silicon Oxide ◽  
Storage Medium ◽  
Holographic Storage ◽  
Bismuth Silicon Oxide

Three-wave and four-wave forward phase-conjugate imaging in photorefractive bismuth silicon oxide

1990 ◽  
Vol 15 (17) ◽  
pp. 935 ◽  
Author(s):  
D. C. Jones ◽  
S. F. Lyuksyutov ◽  
L. Solymar
Keyword(s):  
Silicon Oxide ◽  
Phase Conjugate ◽  
Bismuth Silicon Oxide

Edge-enhanced correlation with four-wave mixing in bismuth silicon oxide crystal by use of moving gratings

2000 ◽  
Vol 39 (23) ◽  
pp. 4112
Author(s):  
Zhaoqi Wang ◽  
Jiuhong Guan ◽  
Baolai Liang ◽  
Guoguang Mu
Keyword(s):  
Silicon Oxide ◽  
Four Wave Mixing ◽  
Wave Mixing ◽  
Bismuth Silicon Oxide ◽  
Oxide Crystal
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