High Power Microwave Detection in Asymmetrically Shaped n-AlxGa1−xAs Structures

Optimization of the confinement energy of quantum-wire states in T-shaped GaAs/AlxGa1-xAs structures.

Tuning of the Landé g-factor in AlxGa1−xAs/AlAs single and double quantum wells

We report on the spin dynamics of a high mobility two-dimensional electron gas in a AlxGa1−xAs/AlAs double quantum well structure. For high electron density samples, the gfactor was measured using time-resolved Kerr rotation technique. The g-factor tuning capability was observed by changing the aluminum content x independently in each well. Experiments demonstrated an unusual spin dephasing tim...

Sacrificial etching of AlxGa1−xAs for III–V MEMS surface micromachining

A study of AlxGa1−xAs as a sacrificial film for surface micromachining is presented. AlxGa1−xAs etch rate and selectivity are measured over a range of aluminum mole fractions and HF etchant concentrations during the release of structural features up to 500 μm in width. The etch process is found to be diffusion limited, with an inverse power law relationship between etch depth and etch rate. Exc...

Numerical Analysis and Device Optimization of Radial p-n Junction GaAs/AlxGa1-xAs Core- Shell Nanowire Solar Cells

Based on the transfer-matrix method and the complex wave impedance approach, this unified electrical and optical numerical simulation thoroughly analyzes the impacts of the design parameters on the transport mechanisms and device characteristics of radial p-n junction GaAs/AlxGa1-xAs core-shell nanowire solar cells. By optimizing the doping density of the core and shell, core radius, shell thic...

Design and fabrication of a high-Q near-field probe for subsurface crack detection

Non-destructive detection and evaluation of invisible cracks in metal structures is an important matter in several critical environments including ground transportation, air transportation and power plants. In this paper, a high-Q near-field Microwave probe is designed and fabricated using defected ground structures for surface and subsurface crack detection in metal structures. For this purpos...