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Analyzes the fabrication of the single and multiple aluminum-gallium arsenide quantum-well structures using liquid-phase epitaxy. Details on the experiments; Results of the study; Conclusions.

Presents a study which examined a hysteresis phenomena of metal-tantalum-oxide-silicon-oxide-silicon capacitors due to leakage current through tantalum oxide. Observation on the C-V behavior of the capacitor; Effects of the direct current and alternating current (ac) resistances of tantalum oxide; Importance of the measurement conditions and the effect of the ac resistance of tantalum oxide on the determination of flat-band capacitance.

Optical waveguides fabricated by gamma-ray irradiation on polymer through a gold mask are presented. The gamma-ray induced index change is found almost linearly dependent on the dose of the irradiation. And the measured propagation losses are low enough for practical application. Due to the high penetrability of gamma ray, uniform refractive index change in depth can be easily achieved. Moreover, due to large-area printing, the uniformity of waveguide made by gamma-ray irradiation is much better than that by e-beam direct writing. [ABSTRACT FROM AUTHOR]

The authors present two-dimensional reconstruction of the refractive index profile of an optical waveguide by using differential near-field optical microscopy. Using an inverse algorithm, the refractive index distribution is obtained directly from the measured optical near-field and its derivatives without any assumption of the index profile. The proposed method also takes advantage of subwavelength resolution and low noises in the waveguide region. Two-dimensional index profile reconstruction of a single mode fiber is measured for the demonstration. The measured optical field distribution and refractive index profile agree quite well with the calculated mode and the known index profile. [ABSTRACT FROM AUTHOR]