We present numerical results that describe how to engineer the radiation pattern of the second harmonic (SH) signal generated by AlGaAs on aluminum oxide all-dielectric nanoantennas. The SH beam divergence is minimized by coherent forward and backward scattering of the radiation emitted at grazing angles from the optical antenna toward a concentric grating grown on the aluminum oxide substrate,...

Plasmonic nanocrystals have been attracting a lot of attention both for fundamental studies and different applications, from sensing to imaging and optoelectronic devices. Transparent conductive oxides represent an interesting class of plasmonic materials in addition to metals and vacancy-doped semiconductor quantum dots. Herein, we report a rational synthetic strategy of high-quality colloidal...

The use of aluminum oxide as the gate insulator for low temperature (<600C) polycrystalline SiGe thin film transistors (TFTs) has been studied. The aluminum oxide was sputtered from a pure aluminum target using a reactive N20 plasma. The composition of the deposited aluminum oxide was found to be almost stoichiomertic (i.e. Al2O3), with a very small fraction of nitrogen incorporation. Even with...

Hydrous amorphous Al (HAO), Fe (HFO), and Mn (HMO) oxides are ubiquitous in the subsurface as both discrete particles and coatings and exhibit a high affinity for heavy metal contaminants. To assess risks associated with heavy metals, such as Pb, to the surrounding environment and manage remedial activities requires accurate mechanistic models with well-defined transport parameters that represe...

Ab initio, molecular orbital calculations for two different Hartree-Fock basis levels were performed on clusters in the system Al-O-H, and tested by comparing derived vibrational frequencies to the measured values for aluminum oxides and aluminum oxyhydroxide minerals. Models were chosen to reflect surface groups that may be present on aluminous minerals such as a-Al2O3 (corundum) and Al(OH)3 (...

A variety of new techniques are emerging that require the use of a patterned substrate to impose micropartitions on a supported fluid bilayermembrane. The barrier-forming characteristics of aluminum oxide, indium-tin oxide (ITO), chrome, and gold patterns on silica substrates have been examined. All four materials form effective barriers to lateral diffusion within the supported membrane; howev...